Can you please help me answer A-D?

Consider planned aggregate expenditure model in a closed economy with lump-sum taxes: Planned investment I=$2.5 trillion Government spending G=$2 trillion Taxes= $3 billion Consumption function C(Y-T)= $2 trillion +0.75(Y-T) A. What is the equilibrium level of output? B. At the equilibrium level of GDP: What is total cost of economy? C. At the equilibrium level of GDP: What is the total savings in the economy? D. What is the government spending multiplier