Using semiannual compounding, find the prices of the following bonds: a. A 8.4%, 15-year bond priced to yield 7.2%. b. A 5.7%, 10-year bond priced to yield 6.9%. c. A 11.6%, 20-year bond priced at 10.4%. Repeat the problem using annual compounding. Then comment on the differences you found in the prices of the bonds. a1. Using semiannual compounding, the price of the bond is $ (Round to the nearest cent.)