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You have to specify a reference in calculating the difference in percent of two numbers, A and B. Normally, it is one of the two numbers in question.

The difference if A is the reference number = 100% * (B-A)/A = 100% * (52 - 65) / 65 = -20.0%.

The difference if B is the reference number = 100% * (A-B)/B = 100% * (62 - 52) / 52 = 19.2%.

P.S. If the reference is not specified, either answer is correct, provided you show your work. The +/- sign in the answer can usually also be ignored when the answer is given in conversations (orally).

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16y ago

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