Suppose the marginal cost of the 1st hour of talking on the phone is $50, the marginal cost of the 2nd hour is $75, and the marginal cost of the 3rd hour is $105. In this case, the total cost of talking on the phone for 3 hours is:
Suppose the marginal cost of the 1st hour of talking on the phone is $50, the marginal cost of the 2nd hour is $75, and the marginal cost of the 3rd hour is $105. In this case, the total cost of talking on the phone for 3 hours is:
A.$315
B.$150
C.$230
D.$105
正确答案：$230
Tag：微观经济学 中国大学MOOC微观经济学
时间：2021-12-11 14:23:21