A percentage is always something over 100.
So you simply need to multiply your fraction to get the denominator (20) to be 100.
You can do this by multiplying by five:
3 x 5 = 15 20 x 5 = 100
This give you 15/100 which is equal to 15%
Another way is my typing the fraction into a calculator and then multiplying by 100.
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