The expected return on a firm's equity is 11%, and the firm has a yield to maturity on its debt of 3%. Debt accounts for 40%, common equity for 55% and preferred equity for 5% of the firm's total market value. If its tax rate is 20%, and the cost of preferred equity is 20%, what is this firm s WACC? Express your answers in strictly numerical terms. For example, if the answer is 5%, write 0.05"