The Following Table Shows the Total Output Produced in a Factory

Multiple Choice

The following table shows the total output produced in a factory at various levels of employment of labor. The firm sells each unit of output at $2 and each worker is paid a wage of $32.
Table 5-1
$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Number of } \\\text { workers }\end{array} & \text { Total output } \\\hline 1 & 8 \\\hline 2 & 18 \\\hline 3 & 30 \\\hline 4 & 41 \\\hline 5 & 50 \\\hline 6 & 56 \\\hline 7 & 60 \\\hline 8 & 61 \\\hline 9 & 62 \\\hline\end{array}$
-Refer to Table 5-1. What is the marginal product of the 5th worker?

A) 9 units
B) 2 units
C) 8 units
D) 6 units
E) 11 units