A 15-year maturity, 8% coupon bond paying coupons semiannually is callable in 7 years at a call price of $1,050. The bond currently sells at a yield to maturity of 9% (4.5% per six months).

a. What is the yield of call?

b. What is the yield to call if the call price is $1,100 and the bond can be called in 3 years instead of 7 years?