Refer to the Following -Goods X and Y Are:
A) Normal
B) Inferior
C)

Multiple Choice

Refer to the following:
$$\begin{array} { l } P _ { X } = 666 - 0.5 Q _ { X } - 2 Q _ { Y } \\P _ { Y } = 484.5 - 1.5 Q _ { Y } - 0.25 Q _ { X } \\M C _ { X } = 20 + 2 Q _ { X } \\M C _ { Y } = 4 + Q _ { Y }\end{array}$$
-Goods X and Y are:

A) normal
B) inferior
C) independent
D) substitutes
E) complements