7) As a consultant for Zip 103 , a company with a target capital structure of 40% debt, 15% preferred stock, and 45% common equity, you need to determine the company's weighted average cost of capital (WACC). Assuming the after-tax cost of debt is 6.00%, the cost of preferred stock is 7.50%, and the cost of retained earnings is 12.75%, and the company is not planning to issue any new shares, what is the WACC for Zip103