The Tyler Oil Company's capital structure is as follows. 35% Debt Preferred stock Common equity The aftertax cost of debt is 7 percent; the cost of preferred stock is 10 percent; and the cost of common equity (in the form of retained earnings) is 13 percent. Calculate Tyler Oil Company's weighted average cost of capital in a manner similar to Table 11-1. (Round the final answers to 2 decimal places.) Weighted Cost Debt (ka) Preferred stock (Kp) Cormon equity (Ke) (retained earnings) Weighted average cost of capital (Ka)