need help with this question please

Investment, Time, and Uncertainty End of Chapter Problem As a New Year's gift to yourself, you buy your roommate's 19% Ford Pinto. She has given you the option of two payment plans. Under Plan A, you pay $500 now, plus $500 at the beginning of each of the next mo years. Under Plan B, you would pay nothing down, but $800 at the beginning of each of the next two years. a. Assuming the interest rate is 10%, the present value of Plan A's payments is - . That of Plan B's payments is - . You should, therefore, choose - b. Assuming the interest rate is 2.0%, the present value of Plan A's payments is - . That of Plan B's payments is ' . You should, therefore, choose ' c. When the interest rate rises, the present value of the plan featuring a down payment - by proportionately ' than that of the plan that does not feature a down payment. This is because down payments aren't discounted