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 product of labour when the firm hires 3 units of labour is ________.The average product of labour when the firm hires 4 units of labour is ________.

A) 30; 33
B) 90; 132
C) 60; 42
D) 90; 222
E) 30; 90