=AVERAGE((B1:D1-A1:C1)/A1:C1)

assuming the numbers are in A1:d1. This is an array formula so commit with
Ctrl-Shift-Enter

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HTH

RP
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"vikgarden" wrote in message
...
Not sure how to do this, If I have a range of numbers, (50, 55, 75, 100)
Percentage of increase is (10%, 36%, 33%)
Average monthly increase is 26%

How do I get excel to calculate the above?