A firm's total assets are $1018 mln. The firm funds the assets with $240 mln of debt, $94 mln. of preferred stock, and the remainder with common equity. What is the firm's WACC if its pre-tax cost of debt is 6%, cost of preferred stock is 7.7%, cost of common equity is 18.3%, and the tax rate is 23%? Express your answer in %, to the nearest 0.01%; drop the % symbol.