You were hired as a consultant to Quigley Company, whose target capital structure is 40% debt, 10% preferred, and 50% common equity. The interest rate on new debt is 7.50%, the yield on the preferred is 6.00%, the cost of retained earnings is 14-50%, and the tax rate is 25%. The firm will not be issuing any new stock. What is Quigley's WACC? Round final answer to two decimal places. Do not round your intermediate calculations. a. 10.10% O b.8.71% O c.9.50% d. 10.85% e. 8.14%