(Weighted average costs of capital) the target capital structure of QM Industries is 40% common stock, 9% preferred stock, and...

(Weighted average costs of capital) the target capital structure of QM Industries is 40% common stock, 9% preferred stock, and 51% debt. if the costs of common equity for the firm is 18.9%, the costs of preferred stock is 9.8%, the before-tax costs is 7.4%, and the firm's tax rate is 35%, what is QM's weighted average costs of capital?