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The word percentage It has its origin in English percentage, a term used to write the numbers under the guise of a fraction of a hundred . The symbol of this concept is the % , which is called "percent" and it translates as "Out of every hundred" . For example: Ten percent is a percentage that is written as 10% and is understood as ten out of one hundred. If it is said that 10% of a group of thirty people have red hair, the phrase assumes that three of those people are redheads.

The dictionary of the Royal Spanish Academy (RAE) define this resource as a 'x' percent . It can be said that the percentage is the amount that, proportionally, refers to a part of the total or to the degree of useful performance that 100 units of a given thing have under normal conditions.

The percentage is also known as the term percentage that we are now addressing and we can determine that it is one of the applications that are most used in what is the field of reasons and proportions. And it helps us to carry out the comparison between quantities.

It is important to emphasize the fact that when carrying out the calculation of percentages it must always be done using what are called directly proportional variables. With this, what is meant is that it has to be the case that if one of them increases, the other also does so and vice versa.

Specifically, when talking about percentages we have to underline that there can be three types of calculation of those. The first would be to have to, from a total amount, find the number that equals what a partial percentage of that is. An example would be having to calculate 50% of an inheritance of one million euros.

The second case would be the case, based on a total amount and a part of it, to establish what percentage this part corresponds to. A case that can serve as an example would be knowing what percentage corresponds to 75 in the number 140.

The third and final case would consist of calculating, from a partial amount and a set percentage, the total figure. Thus, we can know, for example, what total salary an employee receives based on the fact that we know that 500 euros is 60% of it.

A 15% increase in electricity service indicates that users must pay that surplus (15 units per hundred) in rates. Therefore, if the person paid $ 40 per month for such service, after the 15% increase, they will start paying $ 46. In other words, 6 is 15% of 40 (six is ​​fifteen percent of forty, that is, the additional money to be paid after the increase).

A 10% cut in wages, on the other hand, represents that workers will begin to receive a lower pay than they usually received. If a worker earned 1,000 pesos per month, from the cut he will begin to earn 900 pesos per month.

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