Calculating compound interest rates

12 questions

1. Which statement is the equivalent of "Decrease 900 by 21%"?
2. If I increase £45 to £54, what is the percentage gain?
3. What is the amount of simple 1.8% interest earned on an investment of £12 000 over 3 years?
4. What is the amount of compound 1.6% interest earned on an investment of £1900 over 9 years?
5. The cost of a music subscription increases by 1.9% each month for 8 months. It now costs £11.16. What was the original price?
6. What is the amount of simple 2.5% interest earned on an investment of £15 000 over 5 years?
7. The value of a car depreciates by 4% each year. If the car is worth £10 000 when purchased, how much is it worth after 3 years?
8. The value of a poor investment depreciates by 25% each year. If the investment was worth £30 000 when purchased how much is it worth after 3 years?
9. The value of a poor investment depreciates by 8% each year. If the investment was worth £20 000 when purchased how much is it worth after 3 years?
10. A good investment gains value by 12% each year. If the investment was worth £20 000 when purchased, how much is it worth after 3 years?
11. The value of a car is £8671.80 after 4 years of ownership. It was bought for £10 000. What is the percentage decrease per year?
12. The value of a poor investment is £18 544.33 after 5 years of ownership. It was bought for £20 000. What is the percentage decrease in value per year?

License: OGL