## The Basics of Percentages

Before we dive into what 30 of 25 means, it’s important to understand the basics of percentages. Percentages are a way of expressing a portion of a whole as a fraction of 100. For example, if you have 50 out of 100, you can express it as 50%, which means 50 out of 100.

Percentages are often used in everyday life, from calculating discounts to measuring interest rates. To calculate a percentage, you need to divide the part by the whole and multiply by 100. For example, if you have 20 out of 100, you divide 20 by 100 and multiply by 100 to get 20%.

## Understanding “Of”

The term “of” is often used in percentage calculations to indicate the part of the whole that is being calculated. For example, if you want to find 20% of 100, you would use the formula we mentioned earlier: divide the part (20) by the whole (100) and multiply by 100. The result is 20.

Similarly, if you want to find 30% of 25, you would divide 30 by 100 and multiply by 25. The result is 7.5.

## Why Knowing Percentages is Important

Knowing how to calculate percentages is important because it allows you to make informed decisions based on data. For example, if you’re comparing two products that have different prices, you can calculate the percentage difference to see which one offers better value for money.

Similarly, if you’re investing money, you can use percentages to calculate the potential return on investment. This allows you to make an informed decision about whether the investment is worth it or not.

## Calculating Percentages in Real Life

Let’s say you’re shopping online and you see a pair of shoes that are on sale for 30% off. The original price is $25. To calculate the sale price, you would use the following formula:

Sale price = Original price – (Original price x Percentage discount)

In this case, the percentage discount is 30%, or 0.3 as a decimal. Plugging that into the formula, we get:

Sale price = $25 – ($25 x 0.3) = $17.50

So the sale price of the shoes is $17.50.

## Conclusion

Understanding percentages is an important part of everyday life. Whether you’re shopping, investing, or just trying to make sense of data, knowing how to calculate percentages can help you make informed decisions. So the next time you see a percentage, remember to think of it as a fraction of 100 and use the formula we discussed to calculate it.