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Hopefully it's not too late. But first you would have to find the top 20% customers. Once this is done, then a calculation could be created that would be similar to the following:
sum([top 20% dollars])/total(sum([dollars]))
Then, depending how the view was set up, the way the calculation is computed may need to be changed. To do this, right click on the calculation (once it's in the view) and select Compute Using-->correct computation. Hope this helps a bit!
Thanks Tracy it worked!!! Appreciate the help!