please show with calculations

Dickson, Inc., has a debt-equity ratio of 2.1. The firm's weighted average cost of capital is 12 percent and its pretax cost of debt is 9 percent. The tax rate is 24 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 company's weighted average cost of capital be if the company's debt- equity ratio were .60 and 1.10? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) a. Cost of equity Unlevered cost of equity WACC if debt-equity ratio = 0.60 WACC if debt-equity ratio = 1.10 C