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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increase
Convert the margin percentage increase (decrease) to the absolute increase (decrease). Add (subtract) to (from) the selling price.
In order to find the percentage increase and decrease between to numbers are easy. All you have to is subtract the number you start out with to the number it becomes.
47 to 54 is a 14.8936% increase. 54 to 47 is a 12.963% decrease.
450 to 45 is a 90% decrease. 45 to 450 is a 900% increase.