A firm's total assets are $1317 mln. The firm funds the assets with $275 mln of debt, $75 mln. of preferred stock, and the remainder with common equity. What is the firm's WACC if its pre-tax cost of debt is 5.6%, cost of preferred stock is 9.2%, cost of common equity is 17.6%, and the tax rate is 20%? Express your answer in %, to the nearest 0.01%; drop the % symbol.