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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 366 · 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 1300 people. Its population grows by 10%. How many people live there now?
  2. 2.A shop sells 1920 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  3. 3.A price goes up by 30% and then goes up by 50% more. By what percent has it gone up in all? =
  4. 4.The price of a school bag changes from ₹4760 to ₹2380. By what percent did it come down?
  5. 5.The price of a school bag changes from ₹1360 to ₹1768. By what percent did it go up?
  6. 6.A water tank holds 3520 litres. 50% of the water is used. How many litres are left?
  7. 7.The price of a school bag changes from ₹620 to ₹744. By what percent did it go up?
  8. 8.A water tank holds 4900 litres. 30% of the water is used. How many litres are left?
  9. 9.The price of a school bag changes from ₹4160 to ₹6240. By what percent did it go up?
  10. 10.A water tank holds 2420 litres. 50% of the water is used. How many litres are left?
  11. 11.The price of a bicycle is ₹360. It goes up by 50%. What is the new price (in ₹)?
  12. 12.A town has 1420 people. Its population grows by 20%. How many people live there now?
  13. 13.The price of a bicycle is ₹440. It goes up by 5%. What is the new price (in ₹)?
  14. 14.A price goes up by 20% and then comes down by 15%. By what percent has it gone up in all? =
  15. 15.A water tank holds 660 litres. 40% of the water is used. How many litres are left?
  16. 16.A town has 4740 people. Its population grows by 40%. How many people live there now?
  17. 17.A water tank holds 1800 litres. 10% of the water is used. How many litres are left?
  18. 18.A price goes up by 30% and then goes up by 25% more. By what percent has it gone up in all? =
  19. 19.A price comes down by 10% and then comes down by 20% more. By what percent has it come down in all? =
  20. 20.A price goes up by 15% and then goes up by 40% more. By what percent has it gone up in all? =
  21. 21.A water tank holds 3220 litres. 15% of the water is used. How many litres are left?
  22. 22.The price of a bicycle is ₹340. It goes up by 5%. What is the new price (in ₹)?
  23. 23.A water tank holds 3580 litres. 10% of the water is used. How many litres are left?
  24. 24.The price of a school bag changes from ₹2500 to ₹1750. By what percent did it come down?
  25. 25.A water tank holds 4240 litres. 5% of the water is used. How many litres are left?
  26. 26.The price of a bicycle is ₹4060. It goes up by 5%. What is the new price (in ₹)?
  27. 27.A town has 1960 people. Its population grows by 20%. How many people live there now?
  28. 28.The price of a bicycle is ₹3820. It goes up by 20%. What is the new price (in ₹)?
  29. 29.A price goes up by 15% and then goes up by 30% more. By what percent has it gone up in all? =
  30. 30.A water tank holds 120 litres. 10% of the water is used. How many litres are left?
  31. 31.A town has 2780 people. Its population grows by 20%. How many people live there now?
  32. 32.A water tank holds 1420 litres. 40% of the water is used. How many litres are left?
  33. 33.A water tank holds 3260 litres. 40% of the water is used. How many litres are left?
  34. 34.A water tank holds 1880 litres. 25% of the water is used. How many litres are left?
  35. 35.The price of a school bag changes from ₹3380 to ₹5070. By what percent did it go up?
  36. 36.A water tank holds 780 litres. 15% of the water is used. How many litres are left?
  37. 37.A price goes up by 10% and then goes up by 10% more. By what percent has it gone up in all? =
  38. 38.A price comes down by 30% and then comes down by 15% more. By what percent has it come down in all? =
  39. 39.A price goes up by 40% and then comes down by 20%. By what percent has it gone up in all? =
  40. 40.A water tank holds 1900 litres. 15% of the water is used. How many litres are left?

Answer key

  1. 1430
  2. 2112
  3. 95
  4. 50
  5. 30
  6. 1760
  7. 20
  8. 3430
  9. 50
  10. 1210
  11. 540
  12. 1704
  13. 462
  14. 2
  15. 396
  16. 6636
  17. 1620
  18. 62.5
  19. 28
  20. 61
  21. 2737
  22. 357
  23. 3222
  24. 30
  25. 4028
  26. 4263
  27. 2352
  28. 4584
  29. 49.5
  30. 108
  31. 3336
  32. 852
  33. 1956
  34. 1410
  35. 50
  36. 663
  37. 21
  38. 40.5
  39. 12
  40. 1615

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