$($Yield to$$ maturity$)$ The market price is $$$$750$ for a $15$ year bond $($$$1000$ par$$ value$)$ that pays $8$ percent annual$$ interest, but makes interest payments on a semiannual basis $(4$ percent$$ semiannually$).$ What is the$$ bond's yield to$$ maturity?

The$$ bond's yield to maturity is: $\%$

$($Round to two decimal$$ places.$)$