(2 points) (Exercise 3.32) a) Find the present value of an annuity-immediate which pays 1 at the end of each half-year for 7 years, if the rate of interest is 5.6% convertible semiannually for the first 3 years and 9.3% convertible semiannually for the last 4 years. ANSWER (round to 3 decimal places)= b) Find the present value of an annuity- immediate which pays 1 at the end of each half-year for 7 years, if all payments in the first 3 years are discounted at a nominal interest rate 5.6% convertible semiannually and all payments in the last 4 years are discounted at a nominal interest rate 9.3% convertible semiannually. ANSWER (round off to three decimal digits)=