HBM, Inc has the following capital structure: The common stock is currently selling for $12 a share, pays a cash dividend of $0.60 per share, and is growing annually at 6 percent. The preferred stock pays a $10 cash dividend and currently sells for $88 a share. The debt pays interest of 6.0 percent annually, and the firm is in the 30 percent marginal tax bracket. a. What is the after-tax cost of debt? Round your answer to two decimal places. % b. What is the cost of preferred stock? Round your answer to two decimal places. % c. What is the cost of common stock? Assume that the current $0.60 dividend grows by 6 percent during the year. Round your answer to two decimal places. % d. What is the firm's weighted-average cost of capital? Round your answer to two decimal places. %