HYBE has a debt$-$equity ratio of $\mathrm{.}7$ and a tax rate of $21$ percent. The firm does not issue preferred stock. The cost of equity is $14\mathrm{.}3$ percent and the aftertax cost of debt is $6\mathrm{.}09$ percent. What is the weighted average cost of capital? $(10\%)$

A$.7\mathrm{.}93\%$

B$.9\mathrm{.}47\%$

C$.10\mathrm{.}39\%$

D$.10\mathrm{.}92\%$

E$.12\mathrm{.}01\%$