Dusit is financed 30% by debt yielding 8%. Investors require a return of 15% 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? Note: For all the requirements, do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places