Answer:
The real GDP will increase by $10 billion.
Step-by-step 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
=
![change\ in\ government\ spending\ *\ government\ spending\ multiplier](https://img.qammunity.org/2020/formulas/business/high-school/swnhj0bcs9eqs0jjnenboltvka5ar0mpmt.png)
=
![2\ billion\ *(1)/(MPS)](https://img.qammunity.org/2020/formulas/business/high-school/is732p9nnrmde7pfsy9ahx0ihlzlqp0dge.png)
=
![2\ billion\ *(1)/(0.2)](https://img.qammunity.org/2020/formulas/business/high-school/f192tl6onabwo887ikaogtkdfmq268mk2b.png)
=
![2\ billion\ *\ 5](https://img.qammunity.org/2020/formulas/business/high-school/puwh10qyr8avba1zqmmwhbdbf2uc69l017.png)
= $10 billion