Assume that the consumption schedule for a private open economy is such that consumption C = 50 + 0.8Y. Assume further that planned Investment I and net exports X are independent of the level of real GDP and constant at I = 30 and X = 10. Recall also that, in equilibrium, the real output produced (Y) is equal to aggregate expenditures: Y = C + I + X. a. Calculate the equilibrium level of income or real GDP for this economy. b. What happens to equilibrium Y if I changes to 10? What does this outcome reveal about the size of the multiplier?