C = 250 + 0.8 Y

I = 150

G = 300

TR = 100

NX = 100

t =0.25

i) Find the equilibrium level of income.

ii) Suppose, because of the current COVID 19 situation falls to 50, MPS falls to .05, I falls to 10, G falls to 100 and NX falls to 10. How much TR should the government increase to have the same level of equilibrium income as in part i)?

iii) Draw a graph to show the appropriate changes between part i) and part ii).