$C=500+0\mathrm{.}50Y$

Consumption function

I $=1$ comma $500$

Planned investment function

$G=2$ comma $000$

Government spending function

$NX=$ negative $100$

Net export function

$Y=C+$ I $+G+NX$

Equilibrium condition

Part $2$

The equilibrium level $ofGDPis$