Question: Consider the following numerical model: C = 700 + 0.8Y D I = 500-2000i+0.1Y G = 400 T = 500 If G increases from 400

Consider the following numerical model:

C= 700 + 0.8YD

I= 500-2000i+0.1Y

G= 400

T= 500

If G increases from 400 to 600, how much income (Y) changes for any given level of the interest rate in the goods-market equilibrium?

I have no idea which formulas to use or how to work this out?

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