Pid Company has debt with a yield to maturity of 5.7%, a cost of equity of 13.9%, and a cost of preferred stock of 9.1%. The market values of its debt, preferred stock, and equity are $14.5 million, $3.2 million, and $13.9 million, respectively, and its tax rate is 35%. What is this firm's after-tax WACC? Pid's WACC is %. (Round to two decimal places.)