What is a Percentage?

A percentage is a way of expressing a number as a fraction of 100. It is often denoted by the '%' sign and is widely used to compare quantities, calculate discounts, interest rates, and much more.

How to calculate a percentage?

1. Calculate the value of a percentage (e.g., 20% of 150)

This is the most common percentage calculation. It allows you to find the value that corresponds to a certain percentage of a total. This is very useful for calculating discounts, taxes, or commissions.

Formula:

\text{Résultat} = \frac{\text{Pourcentage}}{100} \times \text{Total}

Example: Calculating a discount

An item costs €80. There is a 25% discount. What is the amount of the discount?

\frac{25}{100} \times 80€ = 0.25 \times 80€ = 20€

2. Calculate the percentage of a value (e.g., 35 is what percentage of 50?)

This calculation is useful for determining the proportion of a part relative to a whole. It is often used to analyze results, such as a test score or a product's market share.