Pfd Company has debt with a yield to maturity of 6.4%, a cost of equity of 13.3%, and a cost of preferred stock of 9.6%. The market values of its debt, preferred stock, and equity are $15.3 million, $3.3 million, and $13.9 million, respectively, and its tax rate is 25%. What is this firm's after-tax WACC? Note: Assume that the firm will always be able to utilize its full interest tax shield.