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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 101 · 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 4520 litres. 5% of the water is used. How many litres are left?
  2. 2.A town has 4840 people. Its population grows by 50%. How many people live there now?
  3. 3.A town has 1060 people. Its population grows by 10%. How many people live there now?
  4. 4.A town has 4760 people. Its population grows by 30%. How many people live there now?
  5. 5.A price goes up by 5% and then goes up by 30% more. By what percent has it gone up in all? =
  6. 6.The price of a school bag changes from ₹1080 to ₹648. By what percent did it come down?
  7. 7.The price of a bicycle is ₹2620. It goes up by 5%. What is the new price (in ₹)?
  8. 8.A water tank holds 1320 litres. 20% of the water is used. How many litres are left?
  9. 9.A price comes down by 30% and then comes down by 25% more. By what percent has it come down in all? =
  10. 10.A price comes down by 10% and then comes down by 15% more. By what percent has it come down in all? =
  11. 11.A water tank holds 3020 litres. 30% of the water is used. How many litres are left?
  12. 12.A price comes down by 25% and then comes down by 40% more. By what percent has it come down in all? =
  13. 13.A water tank holds 1900 litres. 30% of the water is used. How many litres are left?
  14. 14.A price comes down by 40% and then comes down by 10% more. By what percent has it come down in all? =
  15. 15.A price goes up by 15% and then goes up by 30% more. By what percent has it gone up in all? =
  16. 16.A shop sells 3640 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  17. 17.The price of a bicycle is ₹4400. It goes up by 40%. What is the new price (in ₹)?
  18. 18.A shop sells 2420 cups of tea a month. Next month it sells 30% more. How many cups does it sell next month?
  19. 19.A price comes down by 15% and then comes down by 25% more. By what percent has it come down in all? =
  20. 20.The price of a school bag changes from ₹4680 to ₹2340. By what percent did it come down?
  21. 21.The price of a school bag changes from ₹2620 to ₹1834. By what percent did it come down?
  22. 22.The price of a school bag changes from ₹2100 to ₹2730. By what percent did it go up?
  23. 23.The price of a school bag changes from ₹4840 to ₹7260. By what percent did it go up?
  24. 24.A price goes up by 10% and then goes up by 5% more. By what percent has it gone up in all? =
  25. 25.The price of a bicycle is ₹4100. It goes up by 5%. What is the new price (in ₹)?
  26. 26.A town has 3840 people. Its population grows by 30%. How many people live there now?
  27. 27.A water tank holds 4720 litres. 10% of the water is used. How many litres are left?
  28. 28.The price of a school bag changes from ₹2380 to ₹2261. By what percent did it come down?
  29. 29.A town has 4660 people. Its population grows by 40%. How many people live there now?
  30. 30.A shop sells 1660 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  31. 31.The price of a bicycle is ₹3860. It goes up by 5%. What is the new price (in ₹)?
  32. 32.A water tank holds 1280 litres. 25% of the water is used. How many litres are left?
  33. 33.A shop sells 3060 cups of tea a month. Next month it sells 15% more. How many cups does it sell next month?
  34. 34.A water tank holds 520 litres. 20% of the water is used. How many litres are left?
  35. 35.A water tank holds 4260 litres. 30% of the water is used. How many litres are left?
  36. 36.A town has 4260 people. Its population grows by 15%. How many people live there now?
  37. 37.The price of a school bag changes from ₹4480 to ₹6272. By what percent did it go up?
  38. 38.A water tank holds 460 litres. 20% of the water is used. How many litres are left?
  39. 39.A water tank holds 400 litres. 5% of the water is used. How many litres are left?
  40. 40.A water tank holds 1740 litres. 30% of the water is used. How many litres are left?

Answer key

  1. 4294
  2. 7260
  3. 1166
  4. 6188
  5. 36.5
  6. 40
  7. 2751
  8. 1056
  9. 47.5
  10. 23.5
  11. 2114
  12. 55
  13. 1330
  14. 46
  15. 49.5
  16. 4550
  17. 6160
  18. 3146
  19. 36.25
  20. 50
  21. 30
  22. 30
  23. 50
  24. 15.5
  25. 4305
  26. 4992
  27. 4248
  28. 5
  29. 6524
  30. 1826
  31. 4053
  32. 960
  33. 3519
  34. 416
  35. 2982
  36. 4899
  37. 40
  38. 368
  39. 380
  40. 1218

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