/*How is the percentage of a value calculated?*/

Multiply the base number by the percentage and divide by 100. For example, 15% of 200 is: $(200 imes 15) / 100 = 30$.

/*How can I break down the VAT of a final price?*/

To remove VAT (for example, 21%), you divide the final price by $1.21$ (or $1 + ext{tax}/100$). The difference between the original price and this result is the tax charged.

/*What is percentage increase?*/

Measures the relative change between an initial value and a final value. It is calculated by subtracting the initial value from the final value, dividing by the initial value and multiplying by 100.

Everyday mathematics: How to calculate percentages, VAT and…

Calculating percentages is one of the most used mathematical applications in everyday life: when evaluating offers in commercial stores, calculating tips, estimating the interest on a loan, or itemizing taxes on purchase invoices.

Despite its daily use, making mistakes when adding or subtracting percentages is very common, especially when trying to apply a discount on a value that already includes VAT.

Key Financial Formulas You Should Master

Discount Calculation:
$$\text{Final Price} = \text{Original Price} \times \left(1 - \frac{\text{Discount}}{100}\right)$$
Breakdown of Tax (VAT):
$$\text{Tax Base} = \frac{\text{Total Price}}{1 + \frac{\text{Tax}}{100}}$$

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