I was given the following information on an assignment:

Using the information below answer the following questions.

IfAD is.......Y =5 (Ao - P/3)

and

ASis .....Y =1,000 ;for P> 600

Ao = Co - mpcTo + Io + Go + Xo - Mo = 600

mpc = 0.8

I have to answer the following underlined question using the above information:

Part 1: The Equilibrium price level(Pe1):

Part 2: The Equilibrium National Income (Ye1):

SupposeGovernment Spending increases by 215

Given the change in government spending:

Part 3: What is the new equilibrium price level (Pe2):

Part 4:What is the new equilibrium national income (Ye2):

Starting again at initial equilibrium, suppose now lump sum taxes are increasedby105

Part 5:What is the new equilibrium price level (Pe3):

Part 6:What is the new equilibrium national income (Ye3):

How do I answer these questions?

this was all the information given in the question, that's why I'm having a hard time with it.