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Accumulation over previous 60 days

Question asked by KGLeidal on Nov 2, 2010
Latest reply on Nov 3, 2010 by philmodjunk

Title

Accumulation over previous 60 days

Post

I would like to calculate the rainfall over the last 60 days (not really, but it's a simple example) and subtract from a maximum allowable amount.  I have the rainfall amounts and dates for the past year.  The final calculation is to subtract the total from the last 60 days from 500.  Suggestions?

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