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Percent of change is the ratio of change is a given amount as a percent. The percent of decrease is a number lesser than the original number. The percent of increase is a number greater than the original number. To find the percent of change you have to take the new number and subtract it to the original number. Then put the change on the top ( whether it's a negative or not) and the original number on the bottom. Even if the top number is greater, **DO NOT PUT IT INTO A MIXED NUMBER**!!!!!!!!!! Instead put it into a improper fraction!!!! Then you can equal it to r/100. That way you can have a percentage that is easy to figure out.

25 - 75 = -50

-50(100) = 75r

- 66.67% = r

100 - 75 = 25

25(100) = 75(r)

33.34% = r