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Conditional Weighted Average

I have two columns. One has cost (column A) and the other has profit (column B). I'd like to calculate the percentage profit as a function of how much something cost. So, if it cost $100 and the profit was $20 I would like to calculate 20%. For all percentages, I'd like to average them. I understand this is a "weighted average" and was able to get this working with this formula:

Code:

=SUMPRODUCT(B:B/A:A)/COUNT(B:B)


However, I don't want to include entries where the profit column has a negative value. I tried something like this:

Code:

=SUMPRODUCT((B:B>0)/(A:A))/COUNTIF(B:B,">0")


This doesn't seem to work quite right as it's not ignoring the cost entry when the profit entry is negative. Any advice?


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with
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