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11.1. How is GDP computed?
Calculate the GDP for a country that in one year sells 10,000 speedboats for $40,000 each and 5,000 race cars for $90,000 each, and nothing else. A speedboat engine contributes $9000 to the total price, and a race car engine is worth $12,000.

850 million

Add the dollar values of the total numbers of speedboats and race cars sold:
(10,000×$40,000)+(5,000×$90,000)=$850 million

The GDP will change each year, depending on how many race cars and speedboats are purchased.