Kiwi Company is financed by $$4$ million $($market value$)$ in debt and $$6$ million $($market value$)$ in equity. The cost of debt is $6\%$ and the cost of equity is $12\%.$ Calculate the weighted average cost of capital $($WACC$).$ Assume $21\%$ tax rate.

Group of answer choices

$11\mathrm{.}29\%$

$9\mathrm{.}10\%$

$8\mathrm{.}26\%$

$10\mathrm{.}60\%$