A 30-year maturity, 8% coupon bond paying coupons semiannually is callable in five years at a call price of $1,100. The bond currently sells at a yield to maturity of 7% (3.5% per half-year).

a. What is the yield to call?

b. What is the yield to call if the call price is only $1,050?

c. What is the yield to call if the call price is $1,100 but the bond can be called in two years instead of five years?