Answer:
The real GDP will increase by $10 billion.
Explanation:
The MPS is given as 0.2.
The increase in government spending is $2 billion.
The horizontal supply curve means that the price level is constant.
The increase in real GDP will be
= [tex]change\ in\ government\ spending\ \times\ government\ spending\ multiplier[/tex]
= [tex]2\ billion\ \times\frac{1}{MPS}[/tex]
= [tex]2\ billion\ \times\frac{1}{0.2}[/tex]
= [tex]2\ billion\ \times\ 5[/tex]
= $10 billion