The Tyler Oil Company's capital structure is as follows: Debt Preferred stock Common equity 25% 3e 45 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 welghted average cost of capital in a manner similar to Table 1:1 (Round the final answers to 2 decimal places.) Weighted cost Debt (ka) Preferred stock (kp? Common equity (K) (retained earnings Weighted average cost of capital (ka)