$($Yield to maturity$)$ A bond's market price is $$1,050.$ It has a $$1,000$ par value, will mature in $6$ 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 $12$ years? What if it matures in $3$ years?

a$.$ The bond's yield to maturity if it matures in $6$ years is $\%.$What about $12$ years? What about $3$ years? $($Round to two decimal places.$)$