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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 844 · 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 3060 people. Its population grows by 30%. How many people live there now?
  2. 2.A shop sells 1800 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  3. 3.A water tank holds 3100 litres. 10% of the water is used. How many litres are left?
  4. 4.The price of a bicycle is ₹4700. It goes up by 25%. What is the new price (in ₹)?
  5. 5.A price goes up by 30% and then goes up by 40% more. By what percent has it gone up in all? =
  6. 6.A water tank holds 1740 litres. 20% of the water is used. How many litres are left?
  7. 7.A price comes down by 15% and then comes down by 10% more. By what percent has it come down in all? =
  8. 8.The price of a bicycle is ₹1360. It goes up by 10%. What is the new price (in ₹)?
  9. 9.A water tank holds 4380 litres. 25% of the water is used. How many litres are left?
  10. 10.A town has 1260 people. Its population grows by 50%. How many people live there now?
  11. 11.A town has 260 people. Its population grows by 20%. How many people live there now?
  12. 12.A price goes up by 20% and then goes up by 5% more. By what percent has it gone up in all? =
  13. 13.The price of a bicycle is ₹1580. It goes up by 10%. What is the new price (in ₹)?
  14. 14.A water tank holds 1000 litres. 5% of the water is used. How many litres are left?
  15. 15.A shop sells 360 cups of tea a month. Next month it sells 25% more. How many cups does it sell next month?
  16. 16.The price of a school bag changes from ₹2840 to ₹2130. By what percent did it come down?
  17. 17.A price goes up by 20% and then comes down by 15%. By what percent has it gone up in all? =
  18. 18.A water tank holds 820 litres. 20% of the water is used. How many litres are left?
  19. 19.A water tank holds 3220 litres. 20% of the water is used. How many litres are left?
  20. 20.A water tank holds 2620 litres. 30% of the water is used. How many litres are left?
  21. 21.A water tank holds 4080 litres. 10% of the water is used. How many litres are left?
  22. 22.A water tank holds 1940 litres. 5% of the water is used. How many litres are left?
  23. 23.A price comes down by 50% and then comes down by 50% more. By what percent has it come down in all? =
  24. 24.The price of a school bag changes from ₹3420 to ₹2736. By what percent did it come down?
  25. 25.A shop sells 3180 cups of tea a month. Next month it sells 15% more. How many cups does it sell next month?
  26. 26.A shop sells 3900 cups of tea a month. Next month it sells 20% more. How many cups does it sell next month?
  27. 27.A price comes down by 15% and then comes down by 25% more. By what percent has it come down in all? =
  28. 28.A shop sells 4640 cups of tea a month. Next month it sells 30% more. How many cups does it sell next month?
  29. 29.The price of a school bag changes from ₹700 to ₹1050. By what percent did it go up?
  30. 30.A town has 4040 people. Its population grows by 10%. How many people live there now?
  31. 31.A water tank holds 4580 litres. 30% of the water is used. How many litres are left?
  32. 32.The price of a bicycle is ₹2280. It goes up by 40%. What is the new price (in ₹)?
  33. 33.A price goes up by 20% and then goes up by 25% more. By what percent has it gone up in all? =
  34. 34.The price of a bicycle is ₹4760. It goes up by 5%. What is the new price (in ₹)?
  35. 35.A water tank holds 200 litres. 50% of the water is used. How many litres are left?
  36. 36.A water tank holds 2400 litres. 10% of the water is used. How many litres are left?
  37. 37.The price of a school bag changes from ₹4940 to ₹5928. By what percent did it go up?
  38. 38.The price of a bicycle is ₹620. It goes up by 20%. What is the new price (in ₹)?
  39. 39.The price of a school bag changes from ₹4440 to ₹3552. By what percent did it come down?
  40. 40.A water tank holds 2080 litres. 20% of the water is used. How many litres are left?

Answer key

  1. 3978
  2. 1980
  3. 2790
  4. 5875
  5. 82
  6. 1392
  7. 23.5
  8. 1496
  9. 3285
  10. 1890
  11. 312
  12. 26
  13. 1738
  14. 950
  15. 450
  16. 25
  17. 2
  18. 656
  19. 2576
  20. 1834
  21. 3672
  22. 1843
  23. 75
  24. 20
  25. 3657
  26. 4680
  27. 36.25
  28. 6032
  29. 50
  30. 4444
  31. 3206
  32. 3192
  33. 50
  34. 4998
  35. 100
  36. 2160
  37. 20
  38. 744
  39. 20
  40. 1664

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