Pfd Company has debt with a yield to maturity of 7.2​, a cost of equity of 14.2%​, and a cost of preferred stock of 10.3%. The market values of its​ debt, preferred​ stock, and equity are 11.3​million, 2.6 ​million, and ​15.8 million, respectively, and its tax rate is 22%. What is this​ firm's after-tax​ WACC? ​
Note: Assume that the firm will always be able to utilize its full interest tax shield.