A firm's total assets are $1065 mln. The firm funds the assets with $252 mln of debt, $88 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%, cost of preferred stock is 9.8%, cost of common equity is 15.9%, and the tax rate is 23%? Express your answer in %, to the nearest 0.01%; drop the % symbol.