Final answer:
The equilibrium GDP for this economy is $10,000 billion.
Step-by-step explanation:
The equilibrium GDP can be found by setting aggregate expenditure (AE) equal to national income (Y). The equation for AE is AE = C + I + G + (X - M). Given the values for C, I, G, X, and M, we can substitute them into the equation and solve for Y.
Plugging in the values, we have:
Y = 50 + 0.90Y + 250 + 175 + 25 - 25
This equation simplifies to:
Y = 500 + 0.90Y
Solving for Y, we find that equilibrium GDP is $10,000 billion.