Solution and Explanation:
GDP is calculated as follows:
Y = C + G + I + NX
where
C = Consumption
G = Government Expenditure
I = Investment
NX = Net Exports
It is mentioned that in 2015, GDP was 50 million and in 2016, it was 48 million without any change in the factors except NX. It means the net exports that is the difference between export and the import of the country has changed and it has fallen by 2 million.