Express the ratio as a fraction. Divide the numerator by the denominator. Multiply by 100.
Example: What percentage is 27 out of 60?
27/60 = 0.45 x 100 = 45%
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Because that it s harder to work out percentages than fractions and decimals
27/50 = 54/100
Double it - to give 90 out of 100 - or 90%
Percentages are always use when comparing one number to another. With you only providing one number Percentages doesn't work very well.
Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.