Table 51 -Refer to Table 5

Multiple Choice

Table 5.1
$$\begin{array} { | l | l | } \hline \text { Quantity Demanded } & \text { Price } \\\hline 10 & \$ 50 \\\hline 20 & \$ 40 \\\hline 30 & \$ 30 \\\hline 40 & \$ 20 \\\hline 50 & \$ 10 \\\hline\end{array}$$
-Refer to Table 5.1.If price decreases from $50 to $40,the price elasticity of demand is _____

A) 10.
B) 5.
C) 3.3.
D) 3.
E) 0.5.