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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 276 · 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 1100 litres. 40% of the water is used. How many litres are left?
  2. 2.A town has 2780 people. Its population grows by 10%. How many people live there now?
  3. 3.A town has 140 people. Its population grows by 25%. How many people live there now?
  4. 4.A town has 4380 people. Its population grows by 10%. How many people live there now?
  5. 5.The price of a school bag changes from ₹2180 to ₹2834. By what percent did it go up?
  6. 6.A shop sells 2020 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  7. 7.The price of a bicycle is ₹5000. It goes up by 10%. What is the new price (in ₹)?
  8. 8.A water tank holds 2500 litres. 10% of the water is used. How many litres are left?
  9. 9.A shop sells 1360 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  10. 10.A price goes up by 40% and then goes up by 40% more. By what percent has it gone up in all? =
  11. 11.The price of a school bag changes from ₹1480 to ₹1184. By what percent did it come down?
  12. 12.The price of a school bag changes from ₹920 to ₹1012. By what percent did it go up?
  13. 13.A town has 4800 people. Its population grows by 20%. How many people live there now?
  14. 14.A town has 1320 people. Its population grows by 30%. How many people live there now?
  15. 15.A shop sells 1880 cups of tea a month. Next month it sells 50% more. How many cups does it sell next month?
  16. 16.A price comes down by 50% and then comes down by 20% more. By what percent has it come down in all? =
  17. 17.The price of a school bag changes from ₹4760 to ₹5950. By what percent did it go up?
  18. 18.A price goes up by 5% and then goes up by 10% more. By what percent has it gone up in all? =
  19. 19.A town has 3760 people. Its population grows by 5%. How many people live there now?
  20. 20.A price goes up by 15% and then goes up by 10% more. By what percent has it gone up in all? =
  21. 21.A shop sells 2480 cups of tea a month. Next month it sells 5% more. How many cups does it sell next month?
  22. 22.A price goes up by 40% and then goes up by 30% more. By what percent has it gone up in all? =
  23. 23.A price goes up by 20% and then comes down by 10%. By what percent has it gone up in all? =
  24. 24.A price comes down by 10% and then comes down by 30% more. By what percent has it come down in all? =
  25. 25.The price of a bicycle is ₹2780. It goes up by 5%. What is the new price (in ₹)?
  26. 26.A price comes down by 50% and then comes down by 25% more. By what percent has it come down in all? =
  27. 27.A water tank holds 4760 litres. 40% of the water is used. How many litres are left?
  28. 28.A town has 2200 people. Its population grows by 20%. How many people live there now?
  29. 29.A water tank holds 2720 litres. 15% of the water is used. How many litres are left?
  30. 30.A price comes down by 15% and then comes down by 20% more. By what percent has it come down in all? =
  31. 31.The price of a bicycle is ₹1440. It goes up by 15%. What is the new price (in ₹)?
  32. 32.A price goes up by 15% and then goes up by 5% more. By what percent has it gone up in all? =
  33. 33.The price of a school bag changes from ₹3760 to ₹4324. By what percent did it go up?
  34. 34.The price of a bicycle is ₹1340. It goes up by 20%. What is the new price (in ₹)?
  35. 35.A water tank holds 3680 litres. 20% of the water is used. How many litres are left?
  36. 36.A town has 1520 people. Its population grows by 25%. How many people live there now?
  37. 37.A water tank holds 4460 litres. 20% of the water is used. How many litres are left?
  38. 38.The price of a school bag changes from ₹4280 to ₹4494. By what percent did it go up?
  39. 39.The price of a school bag changes from ₹3960 to ₹4950. By what percent did it go up?
  40. 40.The price of a school bag changes from ₹4720 to ₹4248. By what percent did it come down?

Answer key

  1. 660
  2. 3058
  3. 175
  4. 4818
  5. 30
  6. 2222
  7. 5500
  8. 2250
  9. 1904
  10. 96
  11. 20
  12. 10
  13. 5760
  14. 1716
  15. 2820
  16. 60
  17. 25
  18. 15.5
  19. 3948
  20. 26.5
  21. 2604
  22. 82
  23. 8
  24. 37
  25. 2919
  26. 62.5
  27. 2856
  28. 2640
  29. 2312
  30. 32
  31. 1656
  32. 20.75
  33. 15
  34. 1608
  35. 2944
  36. 1900
  37. 3568
  38. 5
  39. 25
  40. 10

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