How to calculate percentage error?

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David Shabazi answered

There will most likely be two values given: The approximate value and the exact value. Subtract the approximate value from exact value.

Example: I estimated 260 people, but 325 came.
260 - 325 = -65, ignore the "-" sign, so my error is 65

Show the error as a percent of the exact value. So divide by the exact value and make it a percentage:

65/325 = 0.2 = 20%

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