Williamson, Inc., has a debt-equity ratio of 2.47. The company's weighted average cost of capital is 9 percent, and its pretax cost of debt is 7 percent. The corporate tax rate is 23 percent. a. What is the company's cost of equity capital? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the company's unlevered cost of equity capital? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) c. What would the weighted average cost of capital be if the company's debt-equity ratio were 70 and 1.60 ? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)