Excel percentage formulas can get you through problems large ... and the sales tax is $4.13. To check your answer, just add the two numbers together, or multiply $45.87 by 9%.

Percentage Formula: Percentages are a fundamental concept in maths, used frequently in daily life. It represents parts of a whole as fractions of 100. They're symbolised by the "%" symbol.

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.