# Keynesian-cross analysis [closed]

I have a question from my textbook which is:

Using the Keynesian-cross analysis, assume that the consumption function is given by C = 100 + 0.6(Y – T). If planned investment is 100 and T is 100, then the level of G needed to make equilibrium Y equal 1,000 is:

$$Y = C + I + G$$ (assuming a closed economy)
$$100+0.6(1000-100) + 100 + G = 1000$$, because $$Y = 1000$$