Killer Burgers' capital structure consists of 10 percent debt, 40 percent preferred stock, and 50 percent common stock. If Killer raises new capital, its after-tax cost of debt will be 4.5 percent, its cost of preferred stock will be 7 percent, its cost of retained earnings will be 11.2 percent, and its cost of new common equity will be 12.2 percent. Killer must raise $210,000. 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