Irving Corp. has no debt but can borrow at 6.75 percent. The firms WACC is currently 11 percent, and there is no corporate tax. a. What is the companys cost of equity? (Do not round intermediate calculations and enter your answer as a percent rounded to the nearest whole number, e.g., 32.) b. If the firm converts to 25 percent debt, what will its cost of equity be? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) c. If the firm converts to 50 percent debt, what will its cost of equity be? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) d. What is the companys WACC in parts b) and c)? (Do not round intermediate calculations and enter your answers as a percent rounded to the nearest whole number, e.g., 32.)