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6. Consider a firm having a target capital structure consisting of 50% long-term debt, 20% preferred stock, and 30% common stock. Find the weighted average cost of capital, assuming that the costs of the various sources of funding are as follows: the after-tax cost of long-term debt is 4%, the cost of preferred stock is 12%, and the cost of common stock is 15%. a. 8.70% b. 8.90% c. 9.00% d. 9.20% e. 9.40%