$$\begin{array} { l } C = 40 + 0.8 Y \\I _ { g } = 40 \\X = 20 \\M = 30\end{array}$$

Multiple Choice

$$\begin{array} { l } C = 40 + 0.8 Y \\I _ { g } = 40 \\X = 20 \\M = 30\end{array}$$ (Advanced analysis) The equations give information for a private open economy. The letters $Y , C , I _ { g } , X$ and M stand for GDP, consumption, gross investment, exports, and imports, respectively. Figures are in
Billions of dollars. The equilibrium GDP (=Y) in the economy is

A) $200.
B) $245.
C) $320.
D) $350.