Marco plumbing supply has a pre-tax cost of debt of 7.6 percent, a cost of equity of 12.4 percent, and a cost of preferred stock of 8.5 percent. the firm has 410,000 shares of common stock outstanding at a market price of $19 a share. there are 30,000 shares of preferred stock outstanding at a market price of $31 a share. the bond issue has a face value of $550,000 and a market quote of 98.0. the company's tax rate is 32 percent. what is the firm's weighted average cost of capital