For this to work make sure your calculator is set to Degrees. Although the percentage formula can be written in different forms it is essentially an algebraic equation involving three values. So 40 would be 40 divided by 100 or 40.
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Convert 10 to a decimal by removing the percent sign and dividing by 100. Substitute 010 for 10 in the equation. For this to work make sure your calculator is set to Degrees. You divide your percentage by 100.