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Percentage Increase and Decrease Worksheet

Quantitative aptitude lesson 11: Percentage increase and decrease · Set 136 · 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 3280 litres. 40% of the water is used. How many litres are left?
  2. 2.A water tank holds 3940 litres. 50% of the water is used. How many litres are left?
  3. 3.A town has 3780 people. Its population grows by 5%. How many people live there now?
  4. 4.A water tank holds 3440 litres. 5% of the water is used. How many litres are left?
  5. 5.A water tank holds 1280 litres. 30% of the water is used. How many litres are left?
  6. 6.The price of a school bag changes from ₹880 to ₹616. By what percent did it come down?
  7. 7.A water tank holds 2600 litres. 20% of the water is used. How many litres are left?
  8. 8.The price of a school bag changes from ₹2680 to ₹2144. By what percent did it come down?
  9. 9.A price comes down by 5% and then comes down by 5% more. By what percent has it come down in all? =
  10. 10.A price goes up by 50% and then goes up by 20% more. By what percent has it gone up in all? =
  11. 11.A price comes down by 10% and then comes down by 20% more. By what percent has it come down in all? =
  12. 12.A price goes up by 5% and then goes up by 15% more. By what percent has it gone up in all? =
  13. 13.A town has 3700 people. Its population grows by 20%. How many people live there now?
  14. 14.A water tank holds 3340 litres. 25% of the water is used. How many litres are left?
  15. 15.A price goes up by 20% and then comes down by 10%. By what percent has it gone up in all? =
  16. 16.A water tank holds 100 litres. 40% of the water is used. How many litres are left?
  17. 17.The price of a school bag changes from ₹2980 to ₹3427. By what percent did it go up?
  18. 18.The price of a school bag changes from ₹3620 to ₹5068. By what percent did it go up?
  19. 19.A water tank holds 760 litres. 10% of the water is used. How many litres are left?
  20. 20.The price of a school bag changes from ₹1920 to ₹960. By what percent did it come down?
  21. 21.A town has 3240 people. Its population grows by 30%. How many people live there now?
  22. 22.A price goes up by 30% and then goes up by 50% more. By what percent has it gone up in all? =
  23. 23.The price of a school bag changes from ₹3360 to ₹2520. By what percent did it come down?
  24. 24.The price of a school bag changes from ₹100 to ₹105. By what percent did it go up?
  25. 25.A price goes up by 30% and then goes up by 5% more. By what percent has it gone up in all? =
  26. 26.A water tank holds 3800 litres. 10% of the water is used. How many litres are left?
  27. 27.A water tank holds 2180 litres. 15% of the water is used. How many litres are left?
  28. 28.The price of a school bag changes from ₹3780 to ₹4158. By what percent did it go up?
  29. 29.A town has 3900 people. Its population grows by 30%. How many people live there now?
  30. 30.A shop sells 1080 cups of tea a month. Next month it sells 10% more. How many cups does it sell next month?
  31. 31.A water tank holds 3320 litres. 15% of the water is used. How many litres are left?
  32. 32.A water tank holds 140 litres. 25% of the water is used. How many litres are left?
  33. 33.A price goes up by 25% and then goes up by 10% more. By what percent has it gone up in all? =
  34. 34.A shop sells 3420 cups of tea a month. Next month it sells 40% more. How many cups does it sell next month?
  35. 35.A water tank holds 700 litres. 30% of the water is used. How many litres are left?
  36. 36.A water tank holds 2220 litres. 10% of the water is used. How many litres are left?
  37. 37.The price of a bicycle is ₹1720. It goes up by 25%. What is the new price (in ₹)?
  38. 38.The price of a school bag changes from ₹1480 to ₹1924. By what percent did it go up?
  39. 39.A town has 2760 people. Its population grows by 10%. How many people live there now?
  40. 40.A town has 3440 people. Its population grows by 10%. How many people live there now?

Answer key

  1. 1968
  2. 1970
  3. 3969
  4. 3268
  5. 896
  6. 30
  7. 2080
  8. 20
  9. 9.75
  10. 80
  11. 28
  12. 20.75
  13. 4440
  14. 2505
  15. 8
  16. 60
  17. 15
  18. 40
  19. 684
  20. 50
  21. 4212
  22. 95
  23. 25
  24. 5
  25. 36.5
  26. 3420
  27. 1853
  28. 10
  29. 5070
  30. 1188
  31. 2822
  32. 105
  33. 37.5
  34. 4788
  35. 490
  36. 1998
  37. 2150
  38. 30
  39. 3036
  40. 3784

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