Pfd Company has debt with a yield to maturity of 6.6%, a cost of equity of 12.6%, and a cost of preferred stock of 8.8%. The market values of its debt, preferred stock, and equity are $10.4 million, $2.8 million, and $15.8 million, respectively, and its tax rate is 40% What is this firm's after-tax WACC? Note: Assume that the firm will always be able to utilize its full interest tax shield.