NO.PZ2018062005000020
问题如下：
Which of the following statements about after-tax cost of debt is incorrect?
选项：
A.Compared to common or preferred stock , debt is usually less costly
B.After-tax cost of debt uses the coupon rate on new debt.
C.When use the debt-rating approach, you should choose comparably rated bond of similar maturities. .
解释：
B is correct. After-tax cost of debt uses the market interest rate on new debt.
Floatation Cost不是说 preferred Stock和debt可以ignored since the cost is quite small。 所以A也是不对的啊
