Where I Is Planned Investment, S Is Saving, and Y

Where I is planned investment, S is saving, and Y is gross domestic product (GDP) .
I = I₀ = 80 (6.3)
S = -80 + .4Y (6.4)
-Refer to equations (6.3) and (6.4) . The equilibrium consumption in a private sector closed economy will be:

A) $400.
B) $280.
C) $320.
D) $360.