Yellow Submarine, Co$.$ has a cost of equity of $10\mathrm{.}84$ percent, a cost of debt of $5\mathrm{.}47$ percent, and a tax rate of $21$ percent. The company uses only debt and equity and the company's percentage of debt in its capital structure is $38\%.$ What is the company's WACC?

A$.6\mathrm{.}60\%$

B$.8\mathrm{.}80\%$

C$.10\mathrm{.}82\%$

D$.8\mathrm{.}36\%$