Alex's transaction is an import; he is trading for goods from another country.
Given,
50 bottles at $75 each add up to $3,750.
The US company's sales abroad will be considered export.
The total cost of 200 transistors at $15 each is $3,000
The international trade balance will be 3000 minus 3750 = 750.
The citizen who makes a purchase from a national company contributes to the GDP.
as well as the international trade balance
GDP = 900 - 750 - 150 = 150
3750 imports
3,000 exports
-750 in net exports
GDP = 900 - 750 = 150
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