In a closed economy, economists have collected the following information about the economy for a particular year: Y= 10000 C= 6000 T= 1500 G= 1700. The economists also estimate that the investment function is: 1 = 4300 - 100 r where r is the country's real interest rate, expressed as a percentage. Calculate 1) Private saving 2) Public saving 3) National saving 4) Investment 5) The equilibrium real interest rate