In a small open economy, Desired national saving: Sd=$25 billion +($150 bilion )r; Desired investment: rd=$25 billion ($150 billion )rw : Output: Y=$75 billion: Government purchases: G=$15 billion; World real interest rate: r=2%. a. Find the values of the following variables: (Round all answers to one dec National saving =$ Investment =$ Net exports =$ Current account balance =$ Consumption =$ Absorption = \$S