Navarro Corporation has no debt but can borrow at 6.3 percent. The firms WACC is currently 8.6 percent, and the tax rate is 21 percent. a. What is the companys cost of equity? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. If the firm converts to 20 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 45 percent debt, what will its cost of equity be? (Do not round intermediate calculations and enter your answer as a percent rounded