ONLY Part B AND C needed

Williamson, Inc., has a debt-equity ratio of 2.51. 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 40 percent. 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.) 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.) What would the company's weighted average cost of capital be if the company's debt-equity ratio were.70 and 1.55? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.)