3. A project costs $300 and has cash flows of $50 for the first three years and $75 in each of the project's last three years. What is the payback period of the project? A. 3 years B. 3.75 years C. 4.50 years D. 5 years 4. What is the Weighted Average Cost of Capital (WACC), if the weight of equity in the total capital is 70%, the weight of debt is 30%, the return on equity is 10%, the cost of debt is 8% and the corporate tax rate is 40%? A. 6.58% B. 9.63% C. 18.0% D. 8.44%