Please explain how you got the answers. Thank you.

Brown Industries has a debt-equity ratio of 1.6. Its WACC is 9 percent, and its cost of debt is 4 percent. There is no corporate tax. 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-1. What would the cost of equity be if the debt-equity ratio were 2? (Do not round intermediate calculations and enter your answer as a percent rounded to the nearest whole number, e.g., 32.) b-2. What would the cost of equity be if the debt-equity ratio were .5? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b-3. What would the cost of equity be if the debt-equity ratio were zero? (Do not round intermediate calculations and enter your answer as a percent rounded to the nearest whole number, e.g., 32.) a. Cost of equity a. Cost of equity b-1. Cost of equity b-2. b-3. Cost of equity