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(5 points) (a) Find the present value of an annuity-Immediate which pays 1 at the end of each half-year for five years, if the rate of interest is 9% convertible semiannually for the first three years and 8% convertible semiannually for the last two years. (b) Find the present value of an annuity-immediate which pays 1 at the end of each half-year for five years, if the payments for the first three years are discounted at 9% convertible semiannually and the payments for the last two years are discounted at 8% convertible semiannually . (Note: 9% and 8% are actually interest rates in this problem. They are telling us that when we discount (e. compute the present value of the payments for the first three years, we should use 9% as our interest rate, and when we discount the payments from the last two years, we should use 8% as our interest rate)