Consider the Following Table for a Firm

Multiple Choice

Consider the following table for a firm.The first column shows the number of units of a variable factor of production employed by the firm.
TABLE 13-2
-Refer to Table 13-2.Suppose this firm is a perfect competitor and faces a given price of the product equal to $15 per unit.The marginal revenue product of the 5th unit of the factor is

A) $30.
B) $100.
C) $75.
D) $300.
E) $2220.