'Adding % Change calculation in an Excel Chart

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I was given an Excel assignment to create a stacked bar chart with given data, but as a follow up was asked to show the percentage change by linking to a cell with the % change calculation. The data in the graph only represents May, but wanted me to add a % change calculation from May to June. I am attempting to manually add the calculation in the chart, but am not sure how to link it from another cell. Any thoughts?



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