5. For the economy described in Problem 3, take as given that the multiplier for this economy is 2.5. Find the effect on short-run equilibrium output of: (LO4) a. An increase in government purchases from 1,500 to 1,600. b. A decrease in tax collections from 1,500 to 1,400 (leaving government purchases at their original value). c. A decrease in planned investment spending from 900 to 800.