Economists in Funlandia, a closed economy, have collected the following information about the

economy for a particular year:

$Y = 10,000$

$C = 6,000$

$T = 1,500$

$G = 1,700$

The economists also estimate that the investment function is:

$$I = 3,300 - 100r,$$

where r is the country's real interest rate, expressed as a percentage. Calculate private saving, public saving, national saving, investment, and the equilibrium real interest rate.