Current Attempt in Progress Your answer is incorrect. Cullumber Co. has a capital structure, based on current market values, that consists of 30 percent debt, 10 percent preferred stock, and 60 percent common stock. If the returns required by investors are 8 percent, 10 percent, and 15 percent for the debt, preferred stock, and common stock, respectively, what is Cullumber's after-tax WACC? Assume that the firm's marginal tax rate is 28 percent. (Do not round intermediate calculations. Round answer to 1 decimal place, e.g. 15.2%.) After tax WACC % eTextbook and Media Save for Later Last saved 1 second ago. Saved work will be auto-submitted on the due date. Auto- submission can take up to 10 minutes. Attempts: 2 of 3 used Submit Answer