$($Yield to$$ maturity$)$A$$ bond's market price is $$$$1125.$ It has a $$$$1000$ par$$ 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 $16$years$?$ What if it matures in $4$years$?$