问题如下：
Company M is financed with $20 million debt and $80 million equity. The management wants to borrow another $10 million debt to repurchase the common shares of the same amount. What`s the WACC after the repurchase?
Relevant information regarding the cost of capital is shown in the above table. The tax rate is 30%.
选项：
A.8.90%
B.8.77%
C.8.61%
解释：
C is correct.
考点：Summary of Capital Structure Theories
解析：回购结束后，公司的资本结构变成Wd=30%，We=70%，WACC = 30%*6.0%*(1-30%) + 70%*10.5% = 8.61%.
老师好 这里用weight of equity t= 0.7 是否是因为杠杆后新的 weight of debt 等于0.27 (=30/110) 增加后的weight of equity = 0.7 ?
