{
  "title": "Increase and Decrease Percent (Comparing Quantities) - Grade 8 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "A number increases from 50 to 60. What is the percentage increase?", "options": {"A": "15%", "B": "18%", "C": "20%", "D": "22%"}, "correct_answer": "C"},
    {"id": 2, "difficulty": "easy", "question": "Price decreases from ₹80 to ₹64. Percentage decrease?", "options": {"A": "18%", "B": "19%", "C": "20%", "D": "21%"}, "correct_answer": "C"},
    {"id": 3, "difficulty": "easy", "question": "Population increases from 2000 to 2200. Increase %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "Salary decreases from ₹50000 to ₹45000. Decrease %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "Number 80 increases by 25%. New value?", "options": {"A": "95", "B": "98", "C": "100", "D": "102"}, "correct_answer": "C"},
    {"id": 6, "difficulty": "easy", "question": "Price ₹120 decreases by 15%. New price?", "options": {"A": "₹100", "B": "₹101", "C": "₹102", "D": "₹103"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "If 40 increases to 50, increase %?", "options": {"A": "22%", "B": "23%", "C": "24%", "D": "25%"}, "correct_answer": "D"},
    {"id": 8, "difficulty": "easy", "question": "Weight decreases from 60kg to 54kg. Decrease %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "Number 150 increases by 20%. New number?", "options": {"A": "175", "B": "178", "C": "180", "D": "182"}, "correct_answer": "C"},
    {"id": 10, "difficulty": "easy", "question": "Price ₹200 decreases by 25%. New price?", "options": {"A": "₹145", "B": "₹148", "C": "₹150", "D": "₹152"}, "correct_answer": "C"},
    {"id": 11, "difficulty": "easy", "question": "From 80 to 100, increase %?", "options": {"A": "22%", "B": "23%", "C": "24%", "D": "25%"}, "correct_answer": "D"},
    {"id": 12, "difficulty": "easy", "question": "From 120 to 108, decrease %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "Increase 60 by 15%. Result?", "options": {"A": "67", "B": "68", "C": "69", "D": "70"}, "correct_answer": "C"},
    {"id": 14, "difficulty": "easy", "question": "Decrease 140 by 30%. Result?", "options": {"A": "96", "B": "97", "C": "98", "D": "99"}, "correct_answer": "C"},
    {"id": 15, "difficulty": "easy", "question": "If 200 increases to 220, increase %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 16, "difficulty": "easy", "question": "If 150 decreases to 135, decrease %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 17, "difficulty": "easy", "question": "Increase 250 by 12%. Result?", "options": {"A": "278", "B": "279", "C": "280", "D": "281"}, "correct_answer": "C"},
    {"id": 18, "difficulty": "easy", "question": "Decrease 180 by 15%. Result?", "options": {"A": "151", "B": "152", "C": "153", "D": "154"}, "correct_answer": "C"},
    {"id": 19, "difficulty": "easy", "question": "From 400 to 360, decrease %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "From 500 to 550, increase %?", "options": {"A": "8%", "B": "9%", "C": "10%", "D": "11%"}, "correct_answer": "C"},
    {"id": 21, "difficulty": "medium", "question": "A number increased by 20% gives 120. Original number?", "options": {"A": "95", "B": "98", "C": "100", "D": "102"}, "correct_answer": "C"},
    {"id": 22, "difficulty": "medium", "question": "Price decreased by 25% gives ₹150. Original price?", "options": {"A": "₹195", "B": "₹198", "C": "₹200", "D": "₹202"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "If A is 20% more than B, B is what % less than A?", "options": {"A": "15.67%", "B": "16.67%", "C": "17.67%", "D": "18.67%"}, "correct_answer": "B"},
    {"id": 24, "difficulty": "medium", "question": "Salary increased by 25% then decreased by 20%. Net % change?", "options": {"A": "0%", "B": "1%", "C": "2%", "D": "3%"}, "correct_answer": "A"},
    {"id": 25, "difficulty": "medium", "question": "Number first increased 30% then decreased 30%. Net change %?", "options": {"A": "-8%", "B": "-9%", "C": "-10%", "D": "-11%"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "If x is 40% more than y, y is what % of x?", "options": {"A": "69.43%", "B": "70.43%", "C": "71.43%", "D": "72.43%"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "Length increased by 20% then by 25%. Total increase %?", "options": {"A": "48%", "B": "49%", "C": "50%", "D": "51%"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "Price decreased by 20% then by 15%. Total decrease %?", "options": {"A": "31%", "B": "32%", "C": "33%", "D": "34%"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "If population increases 10% annually, after 2 years total increase %?", "options": {"A": "20%", "B": "21%", "C": "22%", "D": "23%"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "A number decreased by 37.5% gives 100. Original?", "options": {"A": "158", "B": "159", "C": "160", "D": "161"}, "correct_answer": "C"},
    {"id": 31, "difficulty": "medium", "question": "If A is 25% less than B, B is what % more than A?", "options": {"A": "31.33%", "B": "32.33%", "C": "33.33%", "D": "34.33%"}, "correct_answer": "C"},
    {"id": 32, "difficulty": "medium", "question": "Price increased by 16⅔% then decreased by 14.28%. Net change?", "options": {"A": "0%", "B": "1%", "C": "2%", "D": "3%"}, "correct_answer": "A"},
    {"id": 33, "difficulty": "medium", "question": "If number increases 50% then decreases 33⅓%, net change?", "options": {"A": "0%", "B": "1%", "C": "2%", "D": "3%"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "Side of square increased 20%. Area increase %?", "options": {"A": "42%", "B": "43%", "C": "44%", "D": "45%"}, "correct_answer": "C"},
    {"id": 35, "difficulty": "medium", "question": "Radius decreased 10%. Area decrease %?", "options": {"A": "18%", "B": "19%", "C": "20%", "D": "21%"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "If salary increased 15% gives ₹23000, original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 37, "difficulty": "medium", "question": "Number decreased 12% gives 440. Original?", "options": {"A": "₹499", "B": "₹500", "C": "₹501", "D": "₹502"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "If A is 60% more than B, ratio A:B?", "options": {"A": "7:5", "B": "8:5", "C": "9:5", "D": "10:5"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "Price increased 10% then 20%. Total increase %?", "options": {"A": "30%", "B": "31%", "C": "32%", "D": "33%"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "If number decreases 40% then increases 50%. Net change %?", "options": {"A": "-8%", "B": "-9%", "C": "-10%", "D": "-11%"}, "correct_answer": "C"},
    {"id": 41, "difficulty": "medium", "question": "Population increases 20% then decreases 20%. Net change?", "options": {"A": "-2%", "B": "-3%", "C": "-4%", "D": "-5%"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "If x is 30% less than y, x:y?", "options": {"A": "6:10", "B": "7:10", "C": "8:10", "D": "9:10"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "Salary increased 25% gives ₹25000. Original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "Number decreased 37.5% gives 125. Original?", "options": {"A": "198", "B": "199", "C": "200", "D": "201"}, "correct_answer": "C"},
    {"id": 45, "difficulty": "medium", "question": "If A=150% of B, B is what % of A?", "options": {"A": "64.67%", "B": "65.67%", "C": "66.67%", "D": "67.67%"}, "correct_answer": "C"},
    {"id": 46, "difficulty": "medium", "question": "Price decreased 16⅔% gives ₹500. Original?", "options": {"A": "₹598", "B": "₹599", "C": "₹600", "D": "₹601"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "If number increases 100% then decreases 50%. Net change?", "options": {"A": "0%", "B": "1%", "C": "2%", "D": "3%"}, "correct_answer": "A"},
    {"id": 48, "difficulty": "medium", "question": "Side increased 25%. Area increase %?", "options": {"A": "54.25%", "B": "55.25%", "C": "56.25%", "D": "57.25%"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "medium", "question": "Radius increased 15%. Area increase %?", "options": {"A": "31.225%", "B": "32.225%", "C": "33.225%", "D": "34.225%"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "If A is 80% of B, B is what % more than A?", "options": {"A": "23.5%", "B": "24.5%", "C": "25.5%", "D": "26.5%"}, "correct_answer": "C"},
    {"id": 51, "difficulty": "medium", "question": "Number increased 33⅓% gives 200. Original?", "options": {"A": "149", "B": "150", "C": "151", "D": "152"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "Price decreased 28% gives ₹720. Original?", "options": {"A": "₹998", "B": "₹999", "C": "₹1000", "D": "₹1001"}, "correct_answer": "C"},
    {"id": 53, "difficulty": "medium", "question": "If x is 150% of y, y is what % less than x?", "options": {"A": "31.33%", "B": "32.33%", "C": "33.33%", "D": "34.33%"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "medium", "question": "Increase 20% then decrease 25%. Net change?", "options": {"A": "-8%", "B": "-9%", "C": "-10%", "D": "-11%"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "medium", "question": "Decrease 30% then increase 40%. Net change?", "options": {"A": "-0.5%", "B": "-1%", "C": "-1.5%", "D": "-2%"}, "correct_answer": "D"},
    {"id": 56, "difficulty": "medium", "question": "If salary increased 12% gives ₹22400, original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "medium", "question": "Number decreased 45% gives 110. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "medium", "question": "If A=120% of B, ratio A:B?", "options": {"A": "5:6", "B": "6:5", "C": "7:5", "D": "8:5"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "Price increased 15% then 20%. Final price if original ₹1000?", "options": {"A": "₹1378", "B": "₹1379", "C": "₹1380", "D": "₹1381"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "medium", "question": "Decrease 22% then increase 18%. Net change?", "options": {"A": "-7.96%", "B": "-8.96%", "C": "-9.96%", "D": "-10.96%"}, "correct_answer": "A"},
    {"id": 61, "difficulty": "medium", "question": "If population grows 5% annually, after 3 years total growth?", "options": {"A": "15.25%", "B": "15.50%", "C": "15.75%", "D": "16.00%"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "Number increased 66⅔% gives 250. Original?", "options": {"A": "149", "B": "150", "C": "151", "D": "152"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "medium", "question": "Price decreased 33⅓% gives ₹400. Original?", "options": {"A": "₹598", "B": "₹599", "C": "₹600", "D": "₹601"}, "correct_answer": "C"},
    {"id": 64, "difficulty": "medium", "question": "If A is 75% of B, B is what % more than A?", "options": {"A": "31.33%", "B": "32.33%", "C": "33.33%", "D": "34.33%"}, "correct_answer": "C"},
    {"id": 65, "difficulty": "medium", "question": "Increase 25% then decrease 20%. Net change?", "options": {"A": "0%", "B": "1%", "C": "2%", "D": "3%"}, "correct_answer": "A"},
    {"id": 66, "difficulty": "medium", "question": "Decrease 40% then increase 50%. Net change?", "options": {"A": "-8%", "B": "-9%", "C": "-10%", "D": "-11%"}, "correct_answer": "C"},
    {"id": 67, "difficulty": "medium", "question": "If salary increased 18% gives ₹23600, original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 68, "difficulty": "medium", "question": "Number decreased 28% gives 144. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 69, "difficulty": "medium", "question": "If A=140% of B, B is what % less than A?", "options": {"A": "27.57%", "B": "28.57%", "C": "29.57%", "D": "30.57%"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "Price increased 12% then 15%. Total increase?", "options": {"A": "27.8%", "B": "28.8%", "C": "29.8%", "D": "30.8%"}, "correct_answer": "B"},
    {"id": 71, "difficulty": "medium", "question": "Decrease 35% then increase 30%. Net change?", "options": {"A": "-13.5%", "B": "-14.5%", "C": "-15.5%", "D": "-16.5%"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "If population grows 8% annually, after 2 years?", "options": {"A": "16%", "B": "16.64%", "C": "17%", "D": "17.64%"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "Number increased 83⅓% gives 330. Original?", "options": {"A": "179", "B": "180", "C": "181", "D": "182"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "Price decreased 44% gives ₹560. Original?", "options": {"A": "₹999", "B": "₹1000", "C": "₹1001", "D": "₹1002"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "If A is 90% of B, B is what % more than A?", "options": {"A": "10.11%", "B": "11.11%", "C": "12.11%", "D": "13.11%"}, "correct_answer": "B"},
    {"id": 76, "difficulty": "medium", "question": "Increase 40% then decrease 35%. Net change?", "options": {"A": "-7%", "B": "-8%", "C": "-9%", "D": "-10%"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "medium", "question": "Decrease 48% then increase 52%. Net change?", "options": {"A": "-19.04%", "B": "-20.04%", "C": "-21.04%", "D": "-22.04%"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "If salary increased 22% gives ₹24400, original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 79, "difficulty": "medium", "question": "Number decreased 52% gives 96. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "If A=160% of B, ratio A:B?", "options": {"A": "7:5", "B": "8:5", "C": "9:5", "D": "10:5"}, "correct_answer": "B"},
    {"id": 81, "difficulty": "hard", "question": "If price increases 20% then decreases x% to original. x=?", "options": {"A": "15.67%", "B": "16.67%", "C": "17.67%", "D": "18.67%"}, "correct_answer": "B"},
    {"id": 82, "difficulty": "hard", "question": "Number increased by 25% then decreased by 20% gives 120. Original?", "options": {"A": "119", "B": "120", "C": "121", "D": "122"}, "correct_answer": "B"},
    {"id": 83, "difficulty": "hard", "question": "If A is 40% more than B and B is 30% less than C, A is what % of C?", "options": {"A": "95%", "B": "96%", "C": "97%", "D": "98%"}, "correct_answer": "D"},
    {"id": 84, "difficulty": "hard", "question": "Price decreased 20% then increased 25% gives ₹300. Original?", "options": {"A": "₹299", "B": "₹300", "C": "₹301", "D": "₹302"}, "correct_answer": "B"},
    {"id": 85, "difficulty": "hard", "question": "If side of square increased 30%, area increases by?", "options": {"A": "67%", "B": "68%", "C": "69%", "D": "70%"}, "correct_answer": "C"},
    {"id": 86, "difficulty": "hard", "question": "Number increased by 60% then decreased by 37.5% gives 160. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 87, "difficulty": "hard", "question": "If salary increased 15% then decreased 20% gives ₹18400. Original?", "options": {"A": "₹19995", "B": "₹19998", "C": "₹20000", "D": "₹20002"}, "correct_answer": "C"},
    {"id": 88, "difficulty": "hard", "question": "A is 50% more than B, B is 20% less than C. A is what % of C?", "options": {"A": "118%", "B": "119%", "C": "120%", "D": "121%"}, "correct_answer": "C"},
    {"id": 89, "difficulty": "hard", "question": "Price decreased 25% then increased x% to original. x=?", "options": {"A": "31.33%", "B": "32.33%", "C": "33.33%", "D": "34.33%"}, "correct_answer": "C"},
    {"id": 90, "difficulty": "hard", "question": "If radius decreased 20%, area decreases by?", "options": {"A": "35%", "B": "36%", "C": "37%", "D": "38%"}, "correct_answer": "B"},
    {"id": 91, "difficulty": "hard", "question": "Number increased 75% then decreased 40% gives 210. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 92, "difficulty": "hard", "question": "If A=125% of B, B=80% of C, A is what % of C?", "options": {"A": "98%", "B": "99%", "C": "100%", "D": "101%"}, "correct_answer": "C"},
    {"id": 93, "difficulty": "hard", "question": "Price increased 16⅔% then decreased 14.28% gives ₹500. Original?", "options": {"A": "₹499", "B": "₹500", "C": "₹501", "D": "₹502"}, "correct_answer": "B"},
    {"id": 94, "difficulty": "hard", "question": "If side increased 40%, perimeter increases by?", "options": {"A": "38%", "B": "39%", "C": "40%", "D": "41%"}, "correct_answer": "C"},
    {"id": 95, "difficulty": "hard", "question": "Number decreased 33⅓% then increased 50% gives 150. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 96, "difficulty": "hard", "question": "If A=150% of B, B=60% of C, A is what % of C?", "options": {"A": "88%", "B": "89%", "C": "90%", "D": "91%"}, "correct_answer": "C"},
    {"id": 97, "difficulty": "hard", "question": "Price decreased 37.5% then increased 60% gives ₹240. Original?", "options": {"A": "₹299", "B": "₹300", "C": "₹301", "D": "₹302"}, "correct_answer": "B"},
    {"id": 98, "difficulty": "hard", "question": "If radius increased 25%, area increases by?", "options": {"A": "54.25%", "B": "55.25%", "C": "56.25%", "D": "57.25%"}, "correct_answer": "C"},
    {"id": 99, "difficulty": "hard", "question": "Number increased 66⅔% then decreased 40% gives 200. Original?", "options": {"A": "199", "B": "200", "C": "201", "D": "202"}, "correct_answer": "B"},
    {"id": 100, "difficulty": "hard", "question": "If A=120% of B, B=75% of C, A is what % of C?", "options": {"A": "88%", "B": "89%", "C": "90%", "D": "91%"}, "correct_answer": "C"}
  ]
}