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?
Definitions:
Federal Oversight
The supervision and regulation of activities by a federal authority to ensure compliance with laws and standards.
Tuskegee Syphilis Study
An unethical clinical study conducted by the U.S. Public Health Service, where African American men with syphilis were deliberately left untreated to study the disease's progression.
Forty Years
A period of four decades, often used to denote a significant amount of time in discussions of human life, historical events, or long-term changes.
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