Respuesta :
Answer: The answer is $490 billion
Explanation:
In a two sector model of National income
Y = C + I, or Yd = C + S
Where Y = National income, C = consumption , I = investment, Yd = disposable income, S = savings
In the question, tax is said to be a lump sum, which indicate that the tax is constant at all level of GDP. Therefore, the after tax equilibrium level of GDP is 490 billion , with reference to the consumption schedule where consumption of 490 billion is equal to disposable income of 490 billion.