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I made Excel’s doughnut chart change color automatically to track progress, here’s how

In the Format Data Point pane, click the "Fill and Line" paint pot, and in the Fill section, check "Solid fill," and change ...
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Use the PERCENTOF Function to Simplify Percentage Calculations in Excel

Excel's PERCENTOF function returns the percentage that a subset of data contributes to a whole dataset, saving you from having to create additional or complex formulas to generate the same outcome.