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Do the division.

$ \frac{15}{100} = 0.15 = 15\% \cdot 100 $

This also works when the numbers are not 100 (even though that's the definition of a percent!) this is because those fractions are said to be proportional to each other. Thus we can reduce the above fraction to...

$ \frac{3}{20} = 0.15 = 15\% \cdot 100 $

(you can test this with a calculator if you like)