Kose Inc. has a target debt-to-equity ratio of 0.69 . Its WACC is 12.6 percent, and the tax rate is 35 percent. a. If Kose's cost of equity is 15 percent, what is its pre-tax cost of debt? (Do not round intermediate calculations. Round the final answer to 2 decimal places.) Pre-tax cost of debt % b. If instead you know that the after-tax cost of debt is 7.8 percent, what is the cost of equity? (Do not round intermediate calculations. Round the final answer to 2 decimal places.) Cost of equity %