Figure 18-1 on the Graph, L Represents the Quantity of Labor and Labor

Multiple Choice

Figure 18-1
On the graph, L represents the quantity of labor and Q represents the quantity of output per week.
-Refer to Figure 18-1. Suppose the firm sells its output for $15 per unit, and it pays each of its workers $750 per week. When output increases from 210 units to 285 units, the

A) marginal cost is $10 per unit of output.
B) marginal revenue is $5 per unit of output.
C) value of the marginal product of labor is $4,275
D) firm's profit decreases.