Assume that you are on the financial staff of McNulty Corporation, and you have collected the following data: $(1)$ The yield to maturity on the company's outstanding $10\%$ annual coupon bonds is $8\%,$ and its tax rate is $25\%.(2)$ The risk$-$free rate is $3\mathrm{.}0\%,$ the market risk premium $($rM $-$ FRF$)$ is $5\mathrm{.}0\%,$ and the firm's beta is $1\mathrm{.}15.(3)$ The firm's capital structure consists of $45\%$ debt and $55\%$ equity. What is McNulty's WACC? $7\mathrm{.}51\%$O $8\mathrm{.}19\%08\mathrm{.}41\%08\mathrm{.}80\%09\mathrm{.}31\%$