Take It All Away has a cost of equity of $10\mathrm{.}78$ percent, a pretax cost of debt of $5\mathrm{.}43$ percent, and a tax rate of $21$ percent. The company's capital structure consists of $76$ percent debt on a book value basis, but debt is $36$ percent of the company's value on a market value basis. What is the company's WACC?

Multiple Choice

$10\mathrm{.}68\%$

$6\mathrm{.}41\%$

$8\mathrm{.}44\%$

$8\mathrm{.}85\%$