The financial maneger has determined the following schedules for the cost of funds: a. Determine the firm's optimal capital structure, Round your answer to two decimal places. The optimal capital structure consists of % debt resulting in the cost of capital equal to % \%. b. Construct a simple pro forma balance sheet that shows the firm's optimal combination of debt and equity for its current level of assets, Round your answers to the nearest dollar. c. An investment costs $500 and offers annual cash inflows of $186 for four years. Should the firm make the investment? Use Appendox D to answer the question. Round your answer to the nearest whole number. The investment be made since the internal rate of retum that is 06 the cost of capital. d. If the firm makes this additional investment, how shouid its balance sheet appear? Round your answers to the nearest doliar: If the firm is operating with its optimal capital structure and a $500 asset yields 30.0 percent, what return will the stockholders earn on their investment in the asset? Round your answer to two decimal places. %