We are asked to determine the amount per capita of Starbucks. To do that we will divide the number of Starbucks by the number of inhabitants:
[tex]\frac{645}{19890000}[/tex]Solving the operation:
[tex]0.0000324[/tex]This is the answer per capita
In scientific notation, we move the decimal point 5 places to the right and multiply by 10 to the -5, like this:
[tex]0.0000324=3.24\times10^{-5}[/tex]