Help on Intermediate Macroeconomics question

3. Consider an economy described as follows: Y=C+I+G Y=8,000 G = 2,500 T = 2,000 c = 1,000 + .67(Y T) 1 = 1,200 100::- Compute private saving, public saving and national saving Find the equilibrium interest rate Suppose G falls by 500. Compute all saving values. Find the new equilibrium interest rate 999's