A firm's total assets are $1850 mln. The firm funds the assets with $228 mln of debt, $127 mln. of preferred stock, and the remainder with common equity. What is the firm's WACC if its pre-tax cost of debt is 5.2%, cost of preferred stock is 9.3%, cost of common equity is 15.2%, and the tax rate is 29%? Express your answer in %, to the nearest 0.01%; drop the % symbol.