Consider the following components of the aggregate expenditure equilibrium model C 091Y - 2001 200 planned 225 G300 NX-50 Assume all model parameters are in bllons of dollars . What is the marginal propensity to consume in this economy b. What is the level of taxes in this economy billion c. What is the equilibrium level of aggregate expenditure in this economy? billion d. Suppose that planned investment decreases by $30 billion. What is the new equilibrium level of aggregate expenditure in this economy billion billion in this economy the e. When plained investment decreases by $20 billion, the equilibrium level of aggregate expenditure decreases by [ expenditure multiplier is equal to