There are a few different ways you can figure percentages. Most people will usually divide what they have by what would be considered whole and multiply that by 100.
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A number A, as a percentage of B, is 100*A/B
Given an ordered set of groups or classes and percentages for each one, the cumulative percentage is the running total of the percentage values as you go along the groups or classes.
Twenty %20 of 57 is 11.40. To figure out percentages you need to multiply 57 X .20 and then subtract that total from 57.
Percentages are percentages - simple! The marketing people have not yet come up with "new improved" percentages.
The answer depends on what you are trying to do with the percentages.