How to solve this question

QUESTION 1 Consider the following model of the goods market in a closed economy, where's measures the extent of the spread of COVID-19 within th country. This model will be used for all questions in this CML quiz. Z =C+I+G (1) Planned aggregate expenditure C = 3.75 + [0.5 - s] YD (2) Consumption function I = 1 -s (3 Planned investment G = 2 (4) Government expenditure YD = Y -T (5) Disposable income T = 1+0.25Y -TR (6) Net Tax function Y = Z (7 Equilibrium Condition Using the above model and rounding to 3 decimal cases, solve for the equilibrium value of the government expenditure multiplier when the COVID-19 and no transfers s=0 and TR=0