A 20 -year maturity, 8.5% coupon bond paying coupons semiannually is callable in seven years at a call price of $1,125. The bond currently sells at a yield to maturity of 7.5% (3.75\% per half-year). Required: a. What is the yield to call? (Do not round intermediate calculations. Round your answer to 2 decimal places.) b. What is the yield to call if the call price is only $1,075 ? (Do not round intermediate calculations. Round your answer to 2 decimal places.) c. What is the yield to call if the call price is $1,125 but the bond can be called in four years instead of seven years? (Do not round intermediate calculations. Round your answer to 2 decimal places.)