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It is the increase or decrease in some amount, expressed as a percentage of the original amount.

For example, if the price of something goes from 25 to 30 then the original amount was 25 and the increase was 30-25 = 5. So the percentage increase is 5 as a percentage of 25

which is 100*(5/25) = 20%

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Q: What is percentage increase or decrease?
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