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To find a percentage using a calculator, simply divide the part by the whole and then multiply by 100. In Excel, calculating the percentage for an entire column can be done by using the formula '=(cell/total cell)*100' and dragging it down. For converting a decimal to a percent on a Ti-30xs calculator, press the '2ndF' key, followed by the 'PERCENT' key, and then enter the decimal value. These methods provide easy ways to calculate percentages accurately.

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