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.What is the total output per period when this firm is employing labour such that the marginal product of labour is at its maximum?

A) 30
B) 60
C) 90
D) 132
E) 150