Find the required value for each problem. Show the formula used and the counts for each problem.

6. How much more would you earn in three years if you invest $ 10,000 at a compound annual interest rate of 5.75%, instead of at a simple interest rate of 5.75%?

7. What would be the compound annual interest rate you would need to double your investment of $ 1,000 in three years?

8. If your bank pays you 5% annual interest, compounded monthly, how much would you have in ten years if you invest $ 1,000 today?

9. How much would you have to deposit today in a bank account that pays 9.25% annual interest, compounded quarterly, if you expect to have $20,000 at the end of five years?

10. Suppose you invested $ 2,500 in the business that a friend opened and in three years this friend returned $ 3,700 to you. How much was the return on your investment in your friend's business?