What is the marginal propensity to consume the change in

Question

In an? economy, when disposable income increases from? $400 to? $500, consumption expenditure increases from ?$480 billion to ?$540

What is the marginal propensity to? consume, the change in? saving, and the marginal propensity to? save?

1. The marginal propensity to consume is
2. When disposable income increases from? $400 billion to? $500 billion, saving increases by ?how many billion
3. The marginal propensity to save is what