A firm with a $40$ percent marginal tax rate has a capital structure of $$50,000$ in debt and $$150,000$ in equity. What is the firm's weighted cost of capital if the marginal pretax cost of debt is $10$ percent, and the cost of equity is $12$ percent?

$9\mathrm{.}30\%$

$11\mathrm{.}22\%$

$8\mathrm{.}55\%$

$11\mathrm{.}95\%$

$10\mathrm{.}50\%$