The diagram below shows desired aggregate expenditure for a hypothetical economy.Assume the following features of this economy:
∙ marginal propensity to consume (mpc) = 0.80
∙ net tax rate (t) = 0.15
∙ no foreign trade
∙ fixed price level
∙ all expenditure and income figures are in billions of dollars. 
FIGURE 22-3
-Refer to Figure 22-3.Which of the following equations describes the aggregate expenditure function for this economy?
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