Can you please help me with number 4 ?

3. Calculate the marginal propensity to consume for the following situations: a. Consumption increases by $2,000 when disposable income increases by $3,000. b. Consumption increases from $6,000 to $7,000 when disposable income increases from $8,000 to $9,500. c. Disposable income increases from $9,000 to $10,000, but consumption remains the same. d. Disposable income increases by $4,000 causing savings to increase by $1,000. (Hint: Disposable income must be either spent or saved.) 4. Calculate the expenditure multiplier for all four cases in question 3 above