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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 411 · 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 2620 litres. 25% of the water is used. How many litres are left?
  2. 2.A water tank holds 4500 litres. 20% of the water is used. How many litres are left?
  3. 3.The price of a school bag changes from ₹2460 to ₹2091. By what percent did it come down?
  4. 4.A price goes up by 5% and then goes up by 5% more. By what percent has it gone up in all? =
  5. 5.A water tank holds 3280 litres. 25% of the water is used. How many litres are left?
  6. 6.The price of a school bag changes from ₹2080 to ₹1040. By what percent did it come down?
  7. 7.A price goes up by 30% and then goes up by 20% more. By what percent has it gone up in all? =
  8. 8.A town has 720 people. Its population grows by 50%. How many people live there now?
  9. 9.A water tank holds 4920 litres. 20% 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 50% more. How many cups does it sell next month?
  11. 11.A shop sells 640 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  12. 12.A town has 3720 people. Its population grows by 30%. How many people live there now?
  13. 13.A water tank holds 4400 litres. 15% of the water is used. How many litres are left?
  14. 14.A price goes up by 50% and then goes up by 5% more. By what percent has it gone up in all? =
  15. 15.The price of a school bag changes from ₹3260 to ₹1630. By what percent did it come down?
  16. 16.The price of a school bag changes from ₹1120 to ₹1008. By what percent did it come down?
  17. 17.The price of a school bag changes from ₹3340 to ₹3006. By what percent did it come down?
  18. 18.A price comes down by 40% and then comes down by 10% more. By what percent has it come down in all? =
  19. 19.The price of a school bag changes from ₹4000 to ₹4400. By what percent did it go up?
  20. 20.The price of a school bag changes from ₹400 to ₹600. By what percent did it go up?
  21. 21.A town has 3500 people. Its population grows by 50%. How many people live there now?
  22. 22.A water tank holds 3620 litres. 10% of the water is used. How many litres are left?
  23. 23.A water tank holds 2020 litres. 20% of the water is used. How many litres are left?
  24. 24.The price of a school bag changes from ₹4180 to ₹6270. By what percent did it go up?
  25. 25.The price of a school bag changes from ₹4420 to ₹5304. By what percent did it go up?
  26. 26.The price of a school bag changes from ₹380 to ₹399. By what percent did it go up?
  27. 27.The price of a bicycle is ₹3780. It goes up by 20%. What is the new price (in ₹)?
  28. 28.A water tank holds 4240 litres. 50% of the water is used. How many litres are left?
  29. 29.A town has 1780 people. Its population grows by 40%. How many people live there now?
  30. 30.A town has 2180 people. Its population grows by 10%. How many people live there now?
  31. 31.The price of a bicycle is ₹100. It goes up by 50%. What is the new price (in ₹)?
  32. 32.The price of a school bag changes from ₹2460 to ₹1722. By what percent did it come down?
  33. 33.A water tank holds 2260 litres. 40% of the water is used. How many litres are left?
  34. 34.The price of a bicycle is ₹140. It goes up by 20%. What is the new price (in ₹)?
  35. 35.A shop sells 1380 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  36. 36.A shop sells 4440 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  37. 37.A price goes up by 30% and then goes up by 10% more. By what percent has it gone up in all? =
  38. 38.A town has 360 people. Its population grows by 25%. How many people live there now?
  39. 39.The price of a school bag changes from ₹2260 to ₹2599. By what percent did it go up?
  40. 40.A water tank holds 100 litres. 5% of the water is used. How many litres are left?

Answer key

  1. 1965
  2. 3600
  3. 15
  4. 10.25
  5. 2460
  6. 50
  7. 56
  8. 1080
  9. 3936
  10. 2880
  11. 704
  12. 4836
  13. 3740
  14. 57.5
  15. 50
  16. 10
  17. 10
  18. 46
  19. 10
  20. 50
  21. 5250
  22. 3258
  23. 1616
  24. 50
  25. 20
  26. 5
  27. 4536
  28. 2120
  29. 2492
  30. 2398
  31. 150
  32. 30
  33. 1356
  34. 168
  35. 1932
  36. 4662
  37. 43
  38. 450
  39. 15
  40. 95

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