Table 5-3
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​ -Refer to Table 5-3

Table 5-3
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$$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Income } \\\text { (Dollars) }\end{array} & \begin{array} { c } \text { Quantity of Good X } \\\text { Purchased }\end{array} & \begin{array} { c } \text { Quantity of Good Y } \\\text { Purchased }\end{array} \\\hline 30,000 & 2 & 20 \\\hline 40,000 & 6 & 10 \\\hline\end{array}$$
-Refer to Table 5-3. Using the midpoint method, the income elasticity of demand for good Y is

A) 2.33, and good Y is a normal good.
B) −2.33, and good Y is an inferior good.
C) −0.43, and good Y is a normal good.
D) −0.43, and good Y is an inferior good.