Interest rate risk and bond price changes Apex Corp. has two outstanding bond issues. One issue consists of 7% annual coupon bonds and the other issue consists of zero-coupon bonds. For each bond issue, calculate the bond prices and percentage change in prices when the required rate of return changes from 7% to 8%. a. Ten years to maturity and the required rate of return goes from 7% to 8%. b. Twenty years to maturity and the required rate of return goes from 7% to 8%. c. Ten years to maturity and the required rate of return goes from 7% to 6%. d. Twenty years to maturity and the required rate of return goes from 7% to 6%. e. Compare and contrast your answers for parts a through d and comment on your observations