Killer burgers capital structure consist of 30% debt 20% preferred stock and 50% common stock if killer raises new capital it's after-tax cost of debt will be 2.5% its cost of preferred stock will be 9% its cost of retained earnings will be 12.8% and it's cost of new common equity will be 13.8% killer must raise $180,000 if management expects the firm to generate $85,000 and retain earnings this year what is killers marginal cost of capital to raise the needed funds round your answer to two decimal places places