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.
comparably rated bonds of similar maturity 是指债券到期日相同，票面利率不同的意思？
