The table below shows aggregate values for a hypothetical economy. Real GDP is equal to potential GDP. Figures are billions of dollars. Complete parts (a) through (d) below. Potential GDP 665 Net tax revenue 125 Government purchases 145 Investment 20 Consumption 500 a. What is the level of private saving? 40 billion dollars b. What is the level of public saving? billion dollars c. What is the level of national saving? billion dollars d. Is the interest rate at its equilibrium level? How do you know? The interest rate at its equilibrium level, since is