You were hired as a consultant to Bubble Company, whose target capital structure is 40% debt, 15% preferred equity, and 45% common equity. The after-tax cost of debt is 6.00%, the cost of preferred stock is 7.50%, and the cost of common equity is 17.00%. What is the firm's after-tax WACC? 11.18% 11.85% 12.96% 9.61% 12.63%