a. Compute the future value of $2,000 compounded annually for 20 years at 6 percent. (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. Compute the future value of $2,000 compounded annually for 15 years at 9 percent. (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. Compute the future value of $2,000 compounded annually for 25 years at 6 percent. (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)