問個問題..關於cost of debt計算問題.. percent, capital, company, decided, average

willsucceed

cost of capital那章的課後練習.
題目:

Two years ago, a company issued $20 million in long-term bonds at par value with a coupon rate of 9 percent. The company has decided to issue an addi- tional $20 million in bonds and expects the new issue to be priced at par value with a coupon rate of 7 percent. 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 closest to:


答案是 4.2%.
說是用7%*(1-40%)
我想問為什麼在這個題目裏面用的是coupon rate來算cost of debt?


另外一道題是


Dot.Com has determined that it could issue $1,000 face value bonds with an 8 percent coupon paid semi-annually and a five-year maturity at $900 per bond. If Dot.Com's marginal tax rate is 38 percent, its after-tax cost of debt is closest to:
答案是先算出YTM,這個YTM是cost of debt..FV=$1,000MT=$40;N=10V=$900 Solve for i. The six-month yield, i, is 5.3149% YTM = 5.3149%

mp3bu

the new issue to be priced at par value with a coupon rate of 7 percent。

先读懂这句。搞清楚 issue at par，discount，premium 的区别

issue at par 就是说的YTM等于coupon rate