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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 76 · 40 questions
TalentJR

The method (Start value is 100%): New value after a rise of p%: value + p% of value. After a fall: value − p% of value. Percent change = change ÷ starting value × 100. Two changes a% and b% one after the other: a + b + (a × b) ÷ 100, with a fall counted as minus.

NameDateTime takenScore ___ / 40
  1. 1.A water tank holds 1040 litres. 20% of the water is used. How many litres are left?
  2. 2.A water tank holds 4020 litres. 50% of the water is used. How many litres are left?
  3. 3.The price of a school bag changes from ₹3960 to ₹4950. By what percent did it go up?
  4. 4.The price of a school bag changes from ₹700 to ₹595. By what percent did it come down?
  5. 5.The price of a school bag changes from ₹480 to ₹624. By what percent did it go up?
  6. 6.A water tank holds 3520 litres. 15% of the water is used. How many litres are left?
  7. 7.The price of a bicycle is ₹60. It goes up by 10%. What is the new price (in ₹)?
  8. 8.The price of a bicycle is ₹1900. It goes up by 30%. What is the new price (in ₹)?
  9. 9.A town has 920 people. Its population grows by 10%. How many people live there now?
  10. 10.A price goes up by 40% and then comes down by 25%. By what percent has it gone up in all? =
  11. 11.A water tank holds 3340 litres. 15% of the water is used. How many litres are left?
  12. 12.The price of a school bag changes from ₹2880 to ₹2016. By what percent did it come down?
  13. 13.A water tank holds 4620 litres. 50% of the water is used. How many litres are left?
  14. 14.A water tank holds 1360 litres. 20% of the water is used. How many litres are left?
  15. 15.A price comes down by 30% and then comes down by 10% more. By what percent has it come down in all? =
  16. 16.A water tank holds 3960 litres. 25% of the water is used. How many litres are left?
  17. 17.A water tank holds 3980 litres. 10% of the water is used. How many litres are left?
  18. 18.A water tank holds 660 litres. 5% of the water is used. How many litres are left?
  19. 19.The price of a bicycle is ₹2280. It goes up by 20%. What is the new price (in ₹)?
  20. 20.A price goes up by 40% and then goes up by 10% more. By what percent has it gone up in all? =
  21. 21.A price goes up by 50% and then comes down by 5%. By what percent has it gone up in all? =
  22. 22.A shop sells 2900 cups of tea a month. Next month it sells 20% more. How many cups does it sell next month?
  23. 23.A water tank holds 1380 litres. 5% of the water is used. How many litres are left?
  24. 24.A water tank holds 2760 litres. 50% of the water is used. How many litres are left?
  25. 25.The price of a school bag changes from ₹2720 to ₹2584. By what percent did it come down?
  26. 26.A water tank holds 3440 litres. 25% of the water is used. How many litres are left?
  27. 27.The price of a bicycle is ₹1280. It goes up by 20%. What is the new price (in ₹)?
  28. 28.A town has 1620 people. Its population grows by 15%. How many people live there now?
  29. 29.A town has 3100 people. Its population grows by 20%. How many people live there now?
  30. 30.A shop sells 3220 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  31. 31.A water tank holds 1540 litres. 10% of the water is used. How many litres are left?
  32. 32.A price goes up by 20% and then goes up by 25% more. By what percent has it gone up in all? =
  33. 33.The price of a bicycle is ₹4900. It goes up by 50%. What is the new price (in ₹)?
  34. 34.A price goes up by 50% and then comes down by 30%. By what percent has it gone up in all? =
  35. 35.The price of a school bag changes from ₹2500 to ₹2625. By what percent did it go up?
  36. 36.A town has 4760 people. Its population grows by 10%. How many people live there now?
  37. 37.A shop sells 2680 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  38. 38.A water tank holds 920 litres. 5% of the water is used. How many litres are left?
  39. 39.A shop sells 3320 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  40. 40.A water tank holds 3080 litres. 20% of the water is used. How many litres are left?

Answer key

  1. 832
  2. 2010
  3. 25
  4. 15
  5. 30
  6. 2992
  7. 66
  8. 2470
  9. 1012
  10. 5
  11. 2839
  12. 30
  13. 2310
  14. 1088
  15. 37
  16. 2970
  17. 3582
  18. 627
  19. 2736
  20. 54
  21. 42.5
  22. 3480
  23. 1311
  24. 1380
  25. 5
  26. 2580
  27. 1536
  28. 1863
  29. 3720
  30. 3381
  31. 1386
  32. 50
  33. 7350
  34. 5
  35. 5
  36. 5236
  37. 2814
  38. 874
  39. 4150
  40. 2464

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