Table 114 -Refer to Table 11

Table 11.4
$$\begin{array} { | c | c | c | } \hline \text { Number of Workers } & \begin{array} { c } \text { Total } \\\text { Froduct }\end{array} & \begin{array} { c } \text { Product } \\\text { Price } ( \$ ) \end{array} \\\hline 0 & 0 & 4 \\\hline 1 & 15 & 4 \\\hline 2 & 29 & 4 \\\hline 3 & 42 & 4 \\\hline 4 & 54 & 4 \\\hline 5 & 65 & 4 \\\hline 6 & 75 & 4 \\\hline 7 & 84 & 4 \\\hline 8 & 92 & 4 \\\hline 9 & 99 & 4 \\\hline 10 & 105 & 4 \\\hline\end{array}$$
-Refer to Table 11.4,which shows data for a perfectly competitive firm.The first column shows the number of resources employed in production,the second column shows the total product of the firm,and the third column shows its product price.Which of the following is the marginal revenue product of the fifth unit of the resource?

A) $260
B) $130
C) $22
D) $44
E) ?$18