Tableau - What would the LOD calculation be?

I was given to get an answer like given below for my project.

Area Sale Sale (LOD calculation only)
West 130 0
East 90 -40
North 340 210
What LOD calculation would be to get 0, -40, 210 in column Sales (LOD calculation only)?
In this scenario row 2 and row 3 are subtracted from first row. It is easy task to do with Table calculation but i am not able to figure the LOD part out.
Pleae help me.

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