7. Problem 10.18 (WACC and Optimal Capital Budget) Adamson Corporation is considering four average-risk projects with the following costs and rates of return: debt, and 10% preferred stock. a. What is the cost of each of the capital components? Do not round intermediate calculations. Round your answers to two decimal places. Cost of debt: % Cost of preferred stock: Cost of retained earnings: % b. What is Adamson's WACC? Do not round intermediate calculations. Round your answer to two decimal places. \% c. Only projects with expected returns that exceed WACC will be accepted. Which projects should Adamson aocept