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How to calculate percentage difference?

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David Shabazi answered

The difference between two values divided by the average of the two values. Shown as a percentage.

Difference means to subtract one value from another (such as Alex sold 15 tickets, and Sam sold 25; the difference between 25 and 15 is: 25-15 = 10)

Average is the value half-way between:

(first value + second value)/2

The average of 25 and 15 is: (25+15)/2 = 40/2 = 20

The DIFFERENCE as a percentage is:

Difference is 25-15 = 10

Average is (25+15)/2 = 20

10 as a percentage of 20 is:

(10/20) * 100 = 100/2 = 50%

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