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This still assumes you know which value is larger. In this case, the below
formula does not work:
a=5
b=7
(7-5) / 5 = .4 (incorrect)
If a is the start value and b is the end value then you could use
Percent Change = (b-a) / a
If the change is a decrease the answer is negative. If the change is an
increase the answer is positive.
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