What is the yield to maturity $($YTM$)$ of a zero coupon bond with a face value of $$1,000,$ current price of $$740$ and maturity of $9\mathrm{.}0$ years? Recall that the compounding interval is $6$ months and the YTM$,$ like all interest rates, is reported on an annualized basis. $($Allow two decimals in the percentage but do not enter the $\%$ sign.$)$