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Using an expression to calculate a percentage into a chart

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HelloI currently run a report and show, in a table, the % of calls answered within 15 seconds. I do this via an expression:=count(fields!callno.Value)/ReportItems!Textbox10.Value*1)This works fine in a table. However, when I insert a chart (I would like to show this % over the last 3 months), and add this expression to values, the number returned on the chart does not reflect the % figure that appears in the table, e.g. the calculation in the table will say 67%, in the chart the number '1' appears.When I add the above expression to a text box the value 'infinity' appears.So clarly I'm doing something wrong. My first question is can I just copy an expression over from a table and put it in a chart, or do I need a separate expression for the chart? Any pointers towards this would be hugely appreciated.Hopefully this is enough detail but can add more if needed.Many thanks.

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