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Killer Burgers' capital structure consists of $40$ percent debt, $10$ percent preferred stock, and $50$ percent common stock. If Killer raises new capital, its after$-$tax cost of debt will be $4\mathrm{.}5$ percent, its cost of preferred stock will be $7$ percent, its cost of retained earnings will be $11\mathrm{.}5$ percent, and its cost of new common equity will be $12\mathrm{.}5$ percent. Killer must raise $$200,000.$ If management expects the firm to generate $$95,000$ in retained earnings this year, what is Killer's marginal cost of capital to raise the needed funds? Round your answer to two decimal places.