When calculating the equilibrium value of GDP, Y*, after inserting all relevant equations into it, through calculation, I can directly get a number. I didn't find any government expenditure multiplier. I do not konw the meaning of question 4.

QUESTION 1 Consider the following model of the goods market in a closed macroeconomy. Z 5 C +1 + G (1) Components of planned aggregate expenditure C = 5 + 0.8YD (2) Consumption function I = 2 +0.1Y (3) Planned investment G = 1- 0.1Y (4) Government expenditure YD E Y - T (5) Disposable income T = 1+ DAY (6) Tax function Y = Z (7) Equilibrium condition Using this model, solve for the equilibrium value of Y*, rounding to 3 decimal places. QUESTION 4 Using the model in Question 1, calculate the government expenditure multiplier, rounding to 3 decimal places