Calculating WACC Irving Corp. has no debt but can borrow at 6.4 percent. The firm's WACC is currently 10.9 percent, and there is no corporate tax. a. What is the company's cost of equity? b. If the firm converts to 30 percent debt, what will its cost of equity be? C. If the firm converts to 60 percent debt, what will its cost of equity be? d. What is the company's WACC in part (b)? In part (c)