Answer: a. WACC = Ke(E/V) + kp(P/V) + kd(D/V)(1-T)
WACC = 13(65/100) + 6(10/100) + 7(25/100)(1-0.25)
WACC = 8.45 + 0.6 + 1.3125
WACC = 10.36%
WACC is 10.36%
b. The after tax cost of debt = kd(1-T)
= 7(1-0.25)
= 5.25%
Explanation: WACC equals cost of equity multiplied by the proportion of equity in the capital structure plus cost of preferred stock multiplied by the proportion of preferred stock in the capital structure plus cost of debt multiplied by the after-tax proportion of debt in the capital structure.