Please help 3

Using semiannual compounding, find the prices of the following bonds: a. A 9.5%, 15-year bond priced to yield 7.2%. b. A 7.4%, 10-year bond priced to yield 9.7%. c. A 12.3%, 20-year bond priced at 10.0%. Repeat the problem using annual compounding. Then comment on the differences you found in the prices of the bonds