Table 18-2
the Production Details of a Small Apple Farm

Table 18-2
The production details of a small apple farm are shown below.Suppose the market for both apple and apple pickers is competitive, with a current market price for a box of apples being $10.Further, assume apple pickers are the sole marginal cost faced by the farmer in selling his product. $\begin{array}{|l|l|l|l|l|l|}\hline\begin{array}{l}\text { Labour } \\\text { (number of } \\\text { workers) }\end{array} & \begin{array}{l}\text { Output (boxes } \\\text { per day) }\end{array} & \begin{array}{l}\text { Marginal } \\\text { product of } \\\text { labour }\end{array} & \begin{array}{l}\text { Value of the } \\\text { marginal } \\\text { product of } \\\text { labour }\end{array}&\text { Wage }& \begin{array}{l}\text { Marginal } \\\text { profit }\end{array} \\\\\hline 0&0&-&200&\$100\\\hline 1 & 20 & 20 & 160 & \$ 100 & \$ 100 \\\hline 2 & 36 & & 120 & \$ 100 & \$ 60 \\\hline 3 & 48 & 12 & & \$ 100 & \\\hline 4 & & & & \$ 100 & \\\hline 5 & 60 & 4 & & \$ 100 & -\$ 60 \\\hline\end{array}$
-Refer to table 18-2.What is value of the marginal product of labour of the fourth worker?

A) $120
B) $160
C) $80
D) $40