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.The total revenue of the output produced by 12 units of the factor is

A) $120.
B) $520.
C) $640.
D) $768.
E) $1440.