Pfd Company has debt with a yield to maturity of 5.6%, a cost of equity of 14.2%, and a cost of preferred stock of 9.1%. The market values of its debt, preferred stock, and equity are 15.2 million, 2.8 million, and 16.6 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.