Answer :
Aggregate expenditures must have increased by $80 billion. It is because the marginal propensity to consume is 0.80.
Aggregate expenditures can be defined as the sum of all the expenditures undertaken in the economy by the factors during a specific time period. The formula for aggregate expenditures is AE = C + I + G + NX, where (C) is equals to consumptions, (I) is equals to investments, (G) is equals to government spending, and (NX) is equals to net exports.
The marginal propensity to consume or also known as MPC is simply identified as the proportion of an aggregate raise in pay that a consumer spends on the consumption of services and goods, as opposed to saving it.
Marginal propensity = consumption function / change in disposable income
0,8 = consumption function / $100,000,000
Consumption function = $80,000,000 = $80 billion
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