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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 808 · 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 town has 3800 people. Its population grows by 20%. How many people live there now?
  2. 2.A water tank holds 1660 litres. 30% of the water is used. How many litres are left?
  3. 3.A water tank holds 1140 litres. 15% of the water is used. How many litres are left?
  4. 4.The price of a school bag changes from ₹4320 to ₹3888. By what percent did it come down?
  5. 5.A water tank holds 160 litres. 25% of the water is used. How many litres are left?
  6. 6.The price of a school bag changes from ₹760 to ₹1140. By what percent did it go up?
  7. 7.The price of a school bag changes from ₹4020 to ₹6030. By what percent did it go up?
  8. 8.A water tank holds 4200 litres. 10% of the water is used. How many litres are left?
  9. 9.A water tank holds 2740 litres. 30% of the water is used. How many litres are left?
  10. 10.A shop sells 1920 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  11. 11.The price of a school bag changes from ₹3080 to ₹3696. By what percent did it go up?
  12. 12.A shop sells 2100 cups of tea a month. Next month it sells 15% more. How many cups does it sell next month?
  13. 13.A price goes up by 20% and then goes up by 10% more. By what percent has it gone up in all? =
  14. 14.The price of a bicycle is ₹2880. It goes up by 40%. What is the new price (in ₹)?
  15. 15.The price of a bicycle is ₹4820. It goes up by 30%. What is the new price (in ₹)?
  16. 16.A water tank holds 2960 litres. 25% of the water is used. How many litres are left?
  17. 17.The price of a school bag changes from ₹520 to ₹624. By what percent did it go up?
  18. 18.A price comes down by 15% and then comes down by 10% more. By what percent has it come down in all? =
  19. 19.A water tank holds 260 litres. 5% of the water is used. How many litres are left?
  20. 20.A water tank holds 3440 litres. 5% of the water is used. How many litres are left?
  21. 21.The price of a bicycle is ₹3200. It goes up by 50%. What is the new price (in ₹)?
  22. 22.The price of a bicycle is ₹2580. It goes up by 5%. What is the new price (in ₹)?
  23. 23.The price of a bicycle is ₹4880. It goes up by 20%. What is the new price (in ₹)?
  24. 24.A price goes up by 40% and then goes up by 10% more. By what percent has it gone up in all? =
  25. 25.A price goes up by 40% and then comes down by 25%. By what percent has it gone up in all? =
  26. 26.A water tank holds 3360 litres. 30% of the water is used. How many litres are left?
  27. 27.A price goes up by 30% and then goes up by 15% more. By what percent has it gone up in all? =
  28. 28.A price comes down by 25% and then comes down by 5% more. By what percent has it come down in all? =
  29. 29.The price of a school bag changes from ₹3680 to ₹4232. By what percent did it go up?
  30. 30.The price of a school bag changes from ₹100 to ₹95. By what percent did it come down?
  31. 31.The price of a school bag changes from ₹4860 to ₹4374. By what percent did it come down?
  32. 32.A water tank holds 1200 litres. 30% of the water is used. How many litres are left?
  33. 33.A water tank holds 1160 litres. 25% of the water is used. How many litres are left?
  34. 34.A water tank holds 2720 litres. 15% of the water is used. How many litres are left?
  35. 35.A price comes down by 10% and then comes down by 25% more. By what percent has it come down in all? =
  36. 36.A water tank holds 520 litres. 25% of the water is used. How many litres are left?
  37. 37.The price of a bicycle is ₹1000. It goes up by 40%. What is the new price (in ₹)?
  38. 38.A town has 1060 people. Its population grows by 25%. How many people live there now?
  39. 39.A price comes down by 40% and then comes down by 50% more. By what percent has it come down in all? =
  40. 40.A price comes down by 20% and then comes down by 30% more. By what percent has it come down in all? =

Answer key

  1. 4560
  2. 1162
  3. 969
  4. 10
  5. 120
  6. 50
  7. 50
  8. 3780
  9. 1918
  10. 2112
  11. 20
  12. 2415
  13. 32
  14. 4032
  15. 6266
  16. 2220
  17. 20
  18. 23.5
  19. 247
  20. 3268
  21. 4800
  22. 2709
  23. 5856
  24. 54
  25. 5
  26. 2352
  27. 49.5
  28. 28.75
  29. 15
  30. 5
  31. 10
  32. 840
  33. 870
  34. 2312
  35. 32.5
  36. 390
  37. 1400
  38. 1325
  39. 70
  40. 44

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