The company has the following capital structure requirements for the raising of new capital for any new projects the company is undertaking next year. The firm has a corporate tax rate of 40%. What is the weighted average cost of capital? Source of Capital Long-Term Debt Proportion 40% After-tax cost 6% Preferred Stock Common Stock Equity 20% 40% 10% 13% a. 9.60% b. 9.66% c. 10.43% d. 18.60%