Help with macro?

Question

If disposable income = $200 billion and the APS = 0.9, then

savings = $90 billion.

savings = $45 billion.

savings = $180 billion.

savings cannot be determined.

Answer 1

Average Propensity to Save implies that of a certain amount of disposable income, the APS is the proportion of disposable income saved, therefore 0.9 x 200 = $180bn.