What is % of ?
0.0
0.0 * (0.0/100) = 0.0

## Calculating the Percentage of a Value

Calculating the percentage of a value is a common mathematical operation that can be useful in many different contexts, from calculating discounts at a store to determining the percentage of a test grade. In this article, we will explore how to calculate percentages and provide examples of how they can be used.

## Calculating Percentages

To calculate a percentage, you need to divide the value you want to calculate the percentage of by the total value and multiply the result by 100. The formula can be expressed mathematically as:

Percentage = (Value ÷ Total Value) x 100%

For example, if you want to calculate the percentage of 50 out of 100, the calculation would be:

Percentage = (50 ÷ 100) x 100% Percentage = 0.5 x 100% Percentage = 50%

Therefore, 50 is 50% of 100.

Another example would be if you want to calculate the percentage of a test grade. If a student scored 80 out of 100, the calculation would be:

Percentage = (80 ÷ 100) x 100% Percentage = 0.8 x 100% Percentage = 80%

Therefore, the student scored 80% on the test.

## Percentage Usage

Percentages can be used in a variety of contexts. Some common examples include:

Discounts: When a store offers a discount, they will often advertise the percentage off the original price. For example, if an item is on sale for 25% off, and the original price was \$100, the calculation would be: Discount = (25 ÷ 100) x \$100 Discount = \$25
Therefore, the sale price would be \$75.

Interest Rates: When applying for a loan or credit card, the interest rate is often expressed as a percentage. For example, if the interest rate is 5% and the loan amount is \$10,000, the calculation would be: Interest = (5 ÷ 100) x \$10,000 Interest = \$500

Therefore, the borrower would need to pay \$500 in interest.
Growth Rates: In business or finance, percentages can be used to calculate growth rates. For example, if a company's revenue grew from \$1 million to \$1.5 million, the growth rate would be: Growth Rate = ((Final Value - Initial Value) ÷ Initial Value) x 100% Growth Rate = ((\$1.5 million - \$1 million) ÷ \$1 million) x 100% Growth Rate = (0.5 ÷ 1) x 100% Growth Rate = 50%
Therefore, the company's revenue grew by 50%.

Conclusion: Calculating percentages is a simple but powerful mathematical operation that can be used in many different contexts. By understanding how to calculate percentages, you can apply this knowledge to calculate discounts, interest rates, growth rates, and more. With practice, you can become proficient at calculating percentages and use this skill to make more informed decisions in your personal and professional life.