问题如下图：
选项：
A. 
B. 
C. 
解释：
请问老师a选项在哪里错了呢？是average rate？
NO.PZ2016021705000020 谢谢老师
For a given company, the after-tcost of is generally less thboth the cost of preferreequity anthe cost of common equity. For a given company, the investment opportunity schele is upwarsloping because a company invests more in capitprojects, the returns from investing increase. is correct. is generally less costly thpreferreor common stock. The cost of is further receif interest expense is tctible.老师 请问margintrate 和 average trate有什么区别呢？什么是capitproject呢？
该知识点在哪个视频？求边际税率的一般逻辑是什么？
能下没读懂 谢谢老师
请问A为什么不对？
