A bond's market price is $750. It has a ?$1,000 par value, will mature in 8 years, and has a coupon interest rate of 9 percent annual interest, but makes its interest payments semiannually. What is the bond's yield to maturity? What happens to the? bond's yield to maturity if the bond matures in 8 and 16 years? What if it matures in 4 years?