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The simplest way of calculating a percent of change is to divide the difference (subract the starting and ending values) by the starting value.

For instance, if a sweater that originally cost 30.00 is now on sale for 25.00, I can find the percent change (decrease) by dividing 5 (the difference between the numbers) by 30 (the starting value). The resulting decimal number can be converted into a percentage by moving the decimal two spaces to the right.

i.e.: 0.1666 repeating --> 16.666% repeating (or 16.7% if rounded to the nearest tenth).

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Q: What is a percent of change in math?
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