From the following data, find the marginal propensity to consume, compute the expenditure at each level of GDP, and find the equilibrium GDP:
GDP C I G X IM
5,000 3,650 1,000 1,200 700 1,100
5,500 4,000 1,000 1,200 700 1,100
6,000 4,350 1,000 1,200 700 1,100
6,500 4,700 1,000 1,200 700 1,100
7,000 5,050 1,000 1,200 700 1,100
7,500 5,400 1,000 1,200 700 1,100