CFA一级 Corporate Finance Reading37 的课后习题 additional, average, capital, company, decided

北落艾西

其实2013版的课后题跟2014版的课后题是一样的，在2014版的书上P76页的第23题，原题如下
two years ago,a company issued $20 million in long-time bonds at par value with a coupon rate of 9 percent. the company has decided to issue an additional $20 million in bonds and experts the new issue to be priced at par value with a coupon rate of 7 percnet. the company has no other debt outstanding and has a tax rate of 40 percent. to compute the company's weighted average cost of capital, the appropriate after-tax cost of debt is closed to
A 4.2%
B 4.8%
C 5.4%
答案是A， 是直接用coupon rate 7 乘以 1-40% 的出来的，按理说这里的coupon不是YTM，只是coupon rate 而已，应该是YTM 乘以 1-40% 才对。 这个题看不懂
请老师帮我解决一下我的疑惑。

adjani.zhang

回复 1# 北落艾西

注意 issue at par
   the new issue to be priced at par value with a coupon rate of 7 percnet

北落艾西

回复 2# adjani.zhang
谢谢老师提点，我看题太粗心了