How to calculate percentage change?


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David Shabazi answered

"Change" is subtracting one value from another.

Example: You had 5 books, but now have 7. The change is: 7-5 = 2.

"Percentage change" represents that value as a percent of the old value ... So divide by the old value and make it a percentage:

So the percentage change from 5 to 7 is: 2/5 = 0.4 = 40%

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