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GPD : 17.555 trillion dollars
Population : 320 million people
1 Trillion has 12 zeroes
1 Million has 6 zeroes
To Express in scientific notation move the decimal point to the left, and multiply it by 10 ^ (number of places)
17.56 trillion = 1.76 x 10^13
320,000,000 = 3.2 x10^8
Divide:
1.76 x 10^13 / 3.2 x10^8 = 5.5 x 10^4