Refer to the table below. The average benefit of 2 units of activity is:
Refer to the table below. The average benefit of 2 units of activity is:
A.$20
B.$40
C.$60
D.$80
正确答案：$80
Tag：微观经济学 中国大学MOOC微观经济学
时间：2021-12-11 14:23:40