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Field Formula

Question asked by caitlinbarr on Dec 19, 2017
Latest reply on Dec 19, 2017 by philmodjunk

I am making a database on my school stationery store. The pupils have a balance of £35.00. I have added all the necessary fields needed including cumulative spend however I also need to add ‘invoice amount’ which should calculate how much over £35.00 the cumulative spend is. Do you know what calculation I would use and what the formula would be.