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I'm looking for the formula for calculating the weighted average of operation margin data.

From all the sources I've found so far it calculated as following: the sum of all EBIT data divided by the sum of all revenue data.

My question is why is that so? I can't find any books or educational materials supporting this formula.

Seeing as the standard operating margin is calculated with the formula:

$OM = {EBIT \over Revenue} * 100 $

What are the weights of the weighted average and where does the formula for the average comes from?

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