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Percentages aren't always easy to calculate, but one of the best tools in Excel's toolbox is calculating percentages for you. Here's how to do it.

We want to calculate the percentage of annual decline. First, we divide the most current revenue number by the beginning revenue number: $10 million divided by $15 million comes to 0.667.

To calculate your effective tax rate, you need two numbers: the total amount you paid in taxes and your taxable income for ...