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Which Formula To Use For Negative Margin %

Hello,

Can someone help me with the following:

I am working on a spreadsheet with sales figures

For calculating the margin I take the sales value - cost
For calculating the margin % I take the margin /sales value

When I have a sales value > 0 there is no problem

When I have a sales value which is 0 I am getting in trouble
With a sales value of 0 and a cost >0 I am getting #DIV/0!
With a sales value of 0 and a cost of 0 I am getting #DIV/0!

How can I get a negative margin of 100% when I am selling at 0 with a cost > 0
How can I get a 0% margin when I am selling at 0 with a cost of 0
(I know it sounds mad but we have transactions like this)

many thanks in advance for your help


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