Thus, we can obtain on the one hand the percentage representing a specific figure on the total (10 to 20 is 50%, for example), the total that would be obtained taking into account the partial information that we have (if 10 is 50%, the total would be 20) or any percentage figure (50% of 20 is 10).
Instructions:
1
A rule of 3 we have 3 known values and value that you want to find, known values are "A", "B" and "C", the value that we want to know is the "X". The relationship of these values is A is a B, what C is x. Where is X the value that we need to know.
2
See it with an example: we have made a survey to students in a class of 25 students on the quality of teachers, and 8 people have responded to that do not like your tutor, and what percentage of students in the class are not happy with the teachers?
3
In this case we have 25 = 100% (25 students are 100% of the class). And we want to calculate the percentage of negative responses (8 students have said they do not like) out of the total of students (25). The formula to apply is: (number of negative responses * 100) / total of students that is (8 * 100) / 25 = 32.
4
We add the symbol % to the number obtained, and we already have the result: 32% of students in the class are unhappy with their tutor.
5
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The percentage is a mathematical symbol, which represents an amount given as a fraction into 100 equal parts. It is also called commonly both per cent, where percent means "of every one hundred units'. Used to define a relationship between two quantities, so that percentage of an amount, where it is a number, refers to the proportion to that number of units of each 100% of that amount.
The percentage is denoted using the symbol % is mathematically equivalent to 0.01 factor that should be written after the number that refers to, leaving a space of separacion.1 for example, "thirty-two per cent" is represented by 32% and means 'thirty-two of every hundred'. It can also be represented:
32% 32 ⋅ 0, 01 = {\displaystyle 32\,\%=32\cdot 0 {,} 01} {\displaystyle 32\,\%=32\cdot 0 {,} 01}
The percentage calculator symbol.
and, operating:
32% = 0, 32 {\displaystyle 32\, \ % = 0 {,} 32} {\displaystyle 32\, \ % = 0 {,} 32}
32% of 2000, meaning the proportional part to 32 units of every 100 of these 2000, i.e.:
32% 2000 ⋅ = 0, 32 ⋅ 2000 = 640 {\displaystyle 32\,\%\cdot 2000 = 0 {,} 32\cdot 2000 = 640} {\displaystyle 32\,\%\cdot 2000 = 0 {,} 32\cdot 2000 = 640}
640 units in total.
The percentage calculator is used to compare a fraction (which indicates the relationship between two quantities) with another, expressing them through percentages to use 100 as the common denominator. For example, if there is 500 000 suffering from influenza in a total of 10 million people in a country, and in another there are 150 000 people with a total of one million people, it is more clear to express that there is 5% of people with influenza in the first country, and in the second there is a 15%, resulting in one greater proportion in the second country.
If you want to express a change of percentage, it is necessary to clearly distinguish, if we express the change as a percentage of the original core values, or as a percentage of a percentage. For example. If, in a situation where the interest rate is 20%, someone says that "interest rates will rise by ten per cent" (and no, what percent – as with the equivalent statement "interest will rise by ten hundredths"), it may mean different things:
The interest rate will rise to 22%. the original twenty, plus ten percent to twenty.
The interest rate will rise to 30%. the original twenty, plus ten, about to rise.
These meanings are obviously quite different, which can lead to some confusing or erroneous expression, if it is not clear what the core values are based on.
In particular, in the economy and in economic indicators instead of consistent marketing base originally used to distinguish the English term "percentage calculator point", used for the arithmetic difference of two values expressed as a percentage of the same base. in the sentence "the interest will rise by ten percentage points" is meant an increase of ten percent of the original basis (in the above example, the second variant).for the relative change in percent is then sometimes uses the term "percentage".
In the financial area are still present so called. basic point.
Download percentage calculator points is therefore trying to eliminate potential misunderstandings by having a reference always on the same basis. According to the opponents of this concept, but it is a pointless novelty, which doesn't even have its equivalent in per mille or ppm. The alternative is the consistent placing of the basis from which to calculate percentages, and in all situations where the context is not immediately apparent what the basis. Notice in the example above, then:
Interest rates will rise by 10% from your actual interest. (Changes the basis. Therefore interest will rise to 22%.)
Interest rates will rise by 10% of the due amount saved/. (The same basis, i.e. an increase of 10 percentage points. Interest rates will rise to 30%.)
There is no confusion when placing the final percentage – it is then obvious that the basis for calculating interest rates is due/stored. In the example:
Interest rates will rise to 22%.
Interest rates will rise to 30%.
In ancient Rome, long before the emergence of the decimal calculations often performed in fractions of 1/100. For example, Augustus instituted a tax of 1/100, centesima rerum venalium as. Counting with these fractions was similar to counting with percentages. With the increasing nominal value of money in the middle ages began to be the common denominator and percentage calculator from the end of 15. century are becoming a common part of the arithmetic texts. In many of them, these methods are used to calculate the losses and profits, interest rates, and the rule of three. From 17. century, by default, specify the percentage interest rate.
Per cento, c. 1425
Marking in 17. century
The character "%" symbol is a stylised two zeros in the original form (CA. 1425) was utilized a similar symbol (only with horizontal commas instead of oblique) to shorten the notation P cento; Letter P later fell out and used a separate symbol with the horizontal comma (about 1650).
