The Table Given Below Reports the Value of Sales at Each

The table given below reports the value of sales at each stage of production of an economics book.
Table 5.1
$\begin{array}{c}\text { The Production of an Economics Book }\\\begin{array}{|l|c|}\hline {\text { Production Stage }} & \text { Sales Value } \\\hline \text { Purchase of Timber } & \$ 1.25 \\\hline \text { Processing of Timber into Paper } & \$ 7.75 \\\hline \text { Printing } & \$ 24.50 \\\hline \text { Retail Sales of Economics Book } & \$ 38.00 \\\hline\end{array}\end{array}$
-Refer to Table 5.1. What is the contribution to GDP from the production of an economics book?

A) $13.50
B) $7.75
C) $24.50
D) $38
E) $71.50