11. Your parents are planning to retire in 25 years. They currently have $2,000,000 and they would like to have $20,000,000 when they retire. What annual rate of interest would they have to earn on their $2,000,000 to reach their goal, assuming they save no more money?

12. If you deposit $50,000 in an account that pays an annual interest rate of 10% compounded monthly, what will your account balance be in 11 years?

15. How long will it take $50,000 placed in a savings account at 17% interest to grow into $86,620.24?