I don't have a financial calculator. Can the problem be solved using simple math? Without excel?

4. What is Pure Michigan's Cost of Capital (WACC)? Their marginal tax rate = 30.0% 1. before tax cost of debt=8.46%. 2 cost of preferred Stock 6.06% 3. cost of equity 15.99% 4. 4. What is Pure Michigan's Cost of Capital (WACC)? Their marginal tax rate = 30.0% 1. before tax cost of debt=8.46%. 2 cost of preferred Stock 6.06% 3. cost of equity 15.99% 4