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From the question;
The number of Americans who flew to Europe in 2007 = 13.3 million
= 13, 300, 000
This numbers decreased by 18.8% in 2011
Therefore
Decrease = 18.8% times 13,300,000
This gives
[tex]\begin{gathered} \frac{18.8}{100}\times13,300,000 \\ =0.188\times13,300,000 \\ =2,500,400 \end{gathered}[/tex]Therefore, the number decreased by 2,500,400 in 2011
Hence the number of Americans that flew to Europe in 2011
= 13,300,000 - 2,500,400
=10,799,600
Therefore, the number of Americans that flew to Europe in 2011 is 10,799,600