The effect of tax rate of WACC K bell Jewelers whishes to explore the effect on its cost of capital of the rate at which the company pays taxes. The firm whishes to maintain a capital structure of 30% debt. 10% preferred stock, and 60% common stock. The cost of financing with retained earnings is 14% the cost of preferred stock financing is 9% and the before tac cost of debt financing is 6%. Calculate the weighted average cost of capital (WACC) given a tax rate of 25%