Can I get an answer with an explanation?

2. (10 points) Assume a closed economy. GDP (Y) is 12,000. Consumption (C) is given by the equation C = 400 + 0.8(Y T). Investment (1) is given by the equation I = 4,000 200r, where r is the real rate of interest. Taxes (T) are 2000 and government spending (G) is also 2000. a) What are the equilibrium values of C, I, and r? b) What are the values of private saving, public saving, and national saving