The Following Data Show the Total Output for a Firm

Multiple Choice

The following data show the total output for a firm when different amounts of labour are combined with a fixed amount of capital.Assume that the wage per unit of labour is $10 and the cost of the capital is $50.
TABLE 7-3
-Refer to Table 7-3.The average variable cost when this firm is producing 90 units of output is

A) 17 cents.
B) 33 cents.
C) 68 cents.
D) 89 cents.
E) 98 cents.