Answer:
$3 billion
Step-by-step explanation:
Gross domestic product is the sum of all final goods and services produced in an economy within a given period which is usually a year.
Savings is equals to investment.
Savings is the sum of private and public savings
Public savings = taxes - transfer payment - Government Spending
$4 billion - $3 billion - $2billion = ($1 )billion
Private saving = $4 billion
Savings = $4 billion - $1 billion = $3 billion
Savings is equal to investment, so investment would be $3 billion
I hope my answer helps you