Formula field doesn't display 0

Hello,

I have a simple formula field [Volume]/[Count] which gives me the average. 

The issue I'm having is if there is no volume and no count for a particular client, the formula field is blank instead of showing zero. I have checked and both the volume and count fields have the button checked to Treat blank values as "0" in calculations but the result still doesn't give me 0.

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Christine Pratts
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