The after-tax equilibrium level of real GDP will be $540 billion.
GDP which full meaning is gross domestic product can be defined as the value of goods and service in a country at a particular period of time.
The after-tax equilibrium level of real dross domestic product is $540 billion which is the point or level at which total expenditure of $30 billion equal the lump-sum tax of the amount of $30 billion.
Inconclusion the after-tax equilibrium level of real GDP will be $540 billion.
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