A company$$s capital structure consists of $40\%$ debt and $60\%$ equity. The before$-$tax cost of debt is $8\mathrm{.}125\%,$ the cost of retained earnings is $12\%,$ and the tax rate is $35\%.$ What is this company$$s WACC?

Group of answer choices

$9\mathrm{.}31\%$

$13\mathrm{.}80\%$

$7\mathrm{.}20\%$

$11\mathrm{.}88\%$