Dusit is financed 37% by debt yielding 8.7%. Investors require a return of 15.7% on Dusit's equity. a. What is the company's weighted-average cost of capital if the corporate tax rate is 21%? b. What would be the company's cost of capital if it were exempted from corporate tax? (For all the requirements, do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) % Weighted-average cost of capital Weighted average cost of capital b. %