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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look in your math book maybe.
percentage of the whole number that you are taking away
Percent change is the percent amount some value has changed. It has phenomenal usage in every day math and in fields such as business. It's often used to calculate the percent difference in sales between years for business.
Math time! First change 20 percent to a decimal. (.2) then multiply 50 by .2And you get: 10
The percent of 0.309 would be 30.9 percent. This is used in math a lot.