answer both please

DQuestion 4 1 pts what is the after-tax cost of debt for a firm with pre-tax cost of debt equal to 10% and a tax rate of 40%? D Question 5 1 pts A firm has only debt and common equity (no preferred stock). The weight of debt is 20% and the weight of equity is 80%. The cost of equity is 15% and the pre-tax cost of debt is 5%. The firm's tax rate is 40%, what is the firm's WACC