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Introduction
Mathematics is an important subject that we use in our daily lives. It helps us to solve problems, make decisions, and understand the world around us. One of the most common mathematical operations is finding percentages. In this article, we will talk about what is 30 of 15 and how to calculate it.
What is a percentage?
A percentage is a fraction or a part of a whole expressed as a percentage. It is denoted by the symbol % and is used to compare two quantities. For example, if we say that 25% of the students in a class are girls, it means that out of every 100 students, 25 are girls.
What is 30 of 15?
When we say 30 of 15, we are asking what percentage is 30 of 15. To find the answer, we need to divide 30 by 15 and then multiply the result by 100. This gives us:
Calculation:
30 ÷ 15 = 2
2 x 100 = 200%
What does 200% mean?
When we say 200%, we mean that the quantity we are talking about is twice the original quantity. In the case of 30 of 15, it means that 30 is twice as much as 15.
Examples of 30 of 15 in real life
Understanding what is 30 of 15 can be useful in many situations. For example, if you are shopping and you see that a product is marked down by 30%, you can use this knowledge to calculate the sale price. If the original price of the product was $15, the sale price would be:
Calculation:
30% of $15 = 0.30 x $15 = $4.50
Sale price = $15 – $4.50 = $10.50
How to calculate percentages
Calculating percentages is a simple process. To find the percentage of a quantity, we need to multiply the quantity by the percentage as a decimal. For example, to find 25% of 80, we need to multiply 80 by 0.25. This gives us:
Calculation:
25% of 80 = 0.25 x 80 = 20
Another example
Let’s take another example to understand this better. Suppose you want to find 15% of 200. To do this, you need to multiply 200 by 0.15. This gives us:
Calculation:
15% of 200 = 0.15 x 200 = 30
Percentage increase and decrease
Percentages can also be used to calculate increases and decreases. To find the percentage increase or decrease, we need to find the difference between the original and new quantities, divide the difference by the original quantity, and then multiply by 100. For example, if the price of a product goes from $20 to $25, the percentage increase would be:
Calculation:
Percentage increase = ((25 – 20) ÷ 20) x 100 = 25%
Conclusion
Understanding percentages is an important skill that can be useful in many situations. Knowing what is 30 of 15 can help you make better decisions when shopping or dealing with financial matters. Remember that to find a percentage, you need to divide the quantity by the whole and then multiply by 100. With practice, you will become more comfortable with calculating percentages and be able to apply this knowledge in your daily life.
