Consider the Following Production and Cost Schedule for a Firm

Multiple Choice

Consider the following production and cost schedule for a firm.The first column shows the number of units of a variable factor of production employed by the firm.
TABLE 13-1
-Refer to Table 13-1.How many units of this factor of production would the profit-maximizing firm hire if the price of each unit of the factor was $30?

A) 12
B) 13
C) 14
D) 15
E) It is not possible to determine with the data given.