Class 8 Maths Worksheet: Compound Interest
The method (Grow it every year): Year by year: new amount = amount × (100 + R) ÷ 100. Amount after T years = P × (1 + R/100)ᵀ; compound interest = amount − P. A value falling by R% each year: × (100 − R) ÷ 100 every year. For 2 years, CI − SI = P × R × R ÷ 10000.
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- 1.What amount will ₹18900 grow to in 1 year at 5% per year compound interest (in ₹)?
- 2.Find the compound interest on ₹52500 at 12% per year for 2 years, compounded every year (in ₹).
- 3.Find the compound interest on ₹32800 at 5% per year for 2 years, compounded every year (in ₹).
- 4.Find the compound interest on ₹10800 at 5% per year for 2 years, compounded every year (in ₹).
- 5.Find the compound interest on ₹32800 at 20% per year for 1 year, compounded every year (in ₹).
- 6.A scooter is worth ₹37400. Its value falls by 10% every year. What will it be worth after 1 year (in ₹)?
- 7.What is the difference between the compound interest and the simple interest on ₹57500 at 8% per year for 2 years (in ₹)?
- 8.A town has 6100 people. The population grows by 15% every year. What will the population be after 1 year?
- 9.A town has 5300 people. The population grows by 25% every year. What will the population be after 1 year?
- 10.A scooter is worth ₹37500. Its value falls by 8% every year. What will it be worth after 2 years (in ₹)?
- 11.Find the compound interest on ₹27200 at 25% per year for 3 years, compounded every year (in ₹).
- 12.What is the difference between the compound interest and the simple interest on ₹45000 at 8% per year for 2 years (in ₹)?
- 13.What amount will ₹54800 grow to in 2 years at 20% per year compound interest (in ₹)?
- 14.Find the compound interest on ₹25800 at 20% per year for 2 years, compounded every year (in ₹).
- 15.A scooter is worth ₹40000. Its value falls by 5% every year. What will it be worth after 3 years (in ₹)?
- 16.What amount will ₹35000 grow to in 2 years at 8% per year compound interest (in ₹)?
- 17.What is the difference between the compound interest and the simple interest on ₹56400 at 5% per year for 2 years (in ₹)?
- 18.A town has 53200 people. The population grows by 5% every year. What will the population be after 2 years?
- 19.What is the difference between the compound interest and the simple interest on ₹37500 at 8% per year for 2 years (in ₹)?
- 20.What amount will ₹48000 grow to in 2 years at 20% per year compound interest (in ₹)?
- 21.Find the compound interest on ₹41900 at 20% per year for 1 year, compounded every year (in ₹).
- 22.A scooter is worth ₹47200. Its value falls by 25% every year. What will it be worth after 1 year (in ₹)?
- 23.Find the compound interest on ₹8000 at 10% per year for 2 years, compounded every year (in ₹).
- 24.What amount will ₹40000 grow to in 3 years at 5% per year compound interest (in ₹)?
- 25.A scooter is worth ₹54000. Its value falls by 12% every year. What will it be worth after 1 year (in ₹)?
- 26.What is the difference between the compound interest and the simple interest on ₹16000 at 15% per year for 2 years (in ₹)?
- 27.What is the difference between the compound interest and the simple interest on ₹36800 at 25% per year for 2 years (in ₹)?
- 28.A scooter is worth ₹6000. Its value falls by 10% every year. What will it be worth after 3 years (in ₹)?
- 29.Find the compound interest on ₹38000 at 25% per year for 1 year, compounded every year (in ₹).
- 30.A scooter is worth ₹57200. Its value falls by 5% every year. What will it be worth after 2 years (in ₹)?
- 31.What amount will ₹58800 grow to in 1 year at 4% per year compound interest (in ₹)?
- 32.Find the compound interest on ₹26400 at 10% per year for 1 year, compounded every year (in ₹).
- 33.A town has 8000 people. The population grows by 5% every year. What will the population be after 3 years?
- 34.What amount will ₹17700 grow to in 1 year at 25% per year compound interest (in ₹)?
- 35.Find the compound interest on ₹36400 at 25% per year for 1 year, compounded every year (in ₹).
- 36.What amount will ₹6400 grow to in 3 years at 25% per year compound interest (in ₹)?
- 37.A town has 7000 people. The population grows by 15% every year. What will the population be after 1 year?
- 38.What is the difference between the compound interest and the simple interest on ₹9200 at 10% per year for 2 years (in ₹)?
- 39.What is the difference between the compound interest and the simple interest on ₹4700 at 10% per year for 2 years (in ₹)?
- 40.A town has 24800 people. The population grows by 20% every year. What will the population be after 1 year?
Answer key
- 19845
- 13356
- 3362
- 1107
- 6560
- 33660
- 368
- 7015
- 6625
- 31740
- 25925
- 288
- 78912
- 11352
- 34295
- 40824
- 141
- 58653
- 240
- 69120
- 8380
- 35400
- 1680
- 46305
- 47520
- 360
- 2300
- 4374
- 9500
- 51623
- 61152
- 2640
- 9261
- 22125
- 9100
- 12500
- 8050
- 92
- 47
- 29760
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