Please explain and show work

Dickson, Incorporated, has a debt-equity ratio of 2. The firm's weighted average cost of capital is 10 percent and its pretax cost of debt is 7 percent The tax rate is 22 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 debtequity ratio were 50 and 1.00 ? (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g. 32.16.)