Pid Company has debt with a yield to maturity of 6.7%, a cost of equity of 13.4%, and a cost of preferred stock of 9.6%. The market values of its debt, preferred stock, and equity are $14.6million,$2.9million, and $16.2milion, respectively, and its tax rate is 25%. What is this firm's after-tax WACC? Note. Assume that the firm will ahways be able to utilize its full interest tax shield. PId's WACC is W. (Round to fwo decirnal places.)