Refer to Table 21 What Is the Marginal Physical Product of the Fourth Unit

Multiple Choice

Refer to Table 21.3 below: Table 21.3
$$\begin{array} { | c | r | r | } \hline \text { Units of Lubor } & \text { Units of Output } & \text { MPP } \\\hline 0 &0& \\\hline 1 & &30 \\\hline 2 & 66& \\\hline 3 &&30 \\\hline 4 & 116 \\\hline\end{array}$$
What is the marginal physical product of the fourth unit of labor in Table 21.3?

A) 116.
B) 29.
C) 20.
D) 5.