Suppose you just bought an annuity with 20 annual payments of $8,100 per year at the current interest rate of 11 percent per year. a. What is the value of your annuity today? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) b. What happens to the value of your investment if interest rates suddenly drop to 6 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.) c. What if interest rates suddenly rise to 16 percent? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16.)