GreatBig Company has a target capital structure of 40% debt, 15% preferred, and 45% common equity. The after-tax cost of debt is 6.00%, the cost of...

GreatBig Company has a target capital structure of 40% debt, 15% preferred, and 45% common equity. The after-tax cost of debt is 6.00%, the cost of preferred is 7.50%, and the cost of retained earnings is 13.00%. The firm will not be issuing any new stock. What is its WACC?

a. 9.38% b. 11.44% c. 9.19% d. 7.22% e. 10.22%