Chapter 4.2, Problem 7E

A certain cost function has the following graph:

Items

a. The associated marginal cost is

(A) increasing, then decreasing.

(B) decreasing, then increasing.

(C) always increasing.

(D) always decreasing.

b. The marginal cost is least at approximately

(A) $x=0$. (B) $x=50$.

(C) $x=100$. (D) $x=150$.

c. The cost of 50 items is

(A) approximately $20 and increasing at a rate of about $3,000 per item.

(B) approximately $0.50 and increasing at a rate of about $3,000 per item.

(C) approximately $3,000 and increasing at a rate of about $20 per item.

(D) approximately $3,000 and increasing at a rate of about $0.50 per item.