A firm has debt of $$318,200,$ equity of $$493,500,$ an aftertax cost of debt of $6\mathrm{.}80$ percent, a cost of equity of $13\mathrm{.}39$ percent, and a tax rate of $21$ percent. What is the firm's weighted average cost of capital?

Multiple Choice

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$9\mathrm{.}90\%$

$10\mathrm{.}94\%$

$9\mathrm{.}87\%$

$10\mathrm{.}05\%$

$10\mathrm{.}81\%$