Table 141 -Refer to Table 14

Table 14.1
$\begin{array}{|c|c|}\hline \begin{array}{c}\text { Quantity of } \\\text { labour }\end{array} & \text { Output (units) } \\\hline 1 & 80 \\\hline 2 & 170 \\\hline 3 & 240 \\\hline 4 & 300 \\\hline 5 & 350 \\\hline 6 & 390 \\\hline 7 & 420 \\\hline\end{array}$
-Refer to Table 14.1.The marginal product of the fourth unit of labour is

A) 300.
B) 75.
C) 60.
D) 15.

Correct Answer:

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