please show as example What is the marginal propensity to consume when consumption changes from 7 to 6 and disposable income changes from 5 to 3?

please show as example

1. What is the marginal propensity to consume when consumption changes from 7 to 6 and disposable income changes from 5 to 3?
2. If disposable personal income is 10 and consumption is 12, what is personal savings? What does this mean?
3. What is the multiplier when the change in equilibrium level of real GDP in the aggregate expenditures model is 9, and change in autonomous aggregate expenditures is 3?
4. What is the multiplier when the marginal propensity to save is 1/3?
5. What would happen to the marginal propensity to save when a tax cut was enacted causing the multiplier to change to 5?