PLAGE 197096 STAIRS STICKERS, Vinyl, Gray, 100 x 0.1 x 19 cm

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We still don't know what the exact result is, so we take the exponent of both sides of the equation above with some change on the right side. So what is percentage good for? As we wrote earlier, a percentage is a way to express a ratio. Say you are taking a graded exam. If we told you that you got 123 points, it really would not tell you anything. 123 out of what? Now, if we told you that you got 82%, this figure is more understandable information. Even if we told you, you got 123 out of 150; it's harder to feel how well you did. A week earlier, there was another exam, and you scored 195 of 250, or 78%. While it's hard to compare 128 of 150 to 195 of 250, it's easy to tell that an 82% score is better than 78%. Isn't the percent sign helpful? After all, it's the percentage that counts! Later in the text, we explain in more detail what per mille means, what is a basis point and how to convert per milles and basis points to percents. As its name suggests, it is the most frequently used form of logarithm. It is used, for example, in our decibel calculator. Logarithm tables that aimed at easing computation in the olden times usually presented common logarithms, too. times 4.73 ≅ 10

The percentage tells you how number A relates to number B. A real-world example could be: there are two girls in a group of five children. What's the percentage of girls? In other words, we want to know what's the ratio of girls to all children. It's 2 out of 5, or 2/5. We call the first number (2) a numerator and the second number (5) a denominator because this is a fraction. To calculate the percentage, multiply this fraction by 100 and add a percent sign. 100 × numerator / denominator = percentage. In our example, it's 100 × 2/5 = 100 × 0.4 = 40. Forty percent of the group are girls. That's the entire procedure of converting between decimal fractions and percentages. To demonstrate how useful it was in pre-calculator times, let's assume that you need to compute the product of 5.89 × 4.73 without any electronic device. You could do it by merely multiplying things out on paper; however, it would take a bit of time. Instead, you can use the logarithm rule with log tables and get a relatively good approximation of the result. Do you have problems with simplifying fractions? The best way to solve this is by finding the GCF (greatest common factor) of the numerator and denominator and dividing both of them by GCF.This situation is when percentage points come in handy. We use percentage points when we want to talk about a change from one percentage to another. A change from 10% to 12% is two percentage points (or 20 percent).

Let's go the other way around and try to find the numerator. Say we know that 70 percent of fruits in the basket are apples, and there are 30 fruits altogether. It could be worse — they could be lemons. So how many apples do we have? Let's get our percentage formula: 100 × numerator / denominator = percentage. We want to find out the numerator. Let's move all the other parts of the equation to the other side. Divide both sides by 100 (to get rid of 100 on the left) and then multiply both sides by the denominator. This is what we get: numerator = percentage × denominator / 100. Let's substitute percentage and denominator with our values: numerator = 70 × 30 / 100. Now it's easy: numerator = 2100 / 100 = 21, we have 21 apples. Should be enough for lunch or a rather violent food fight. A percentage is also a way to express the relation between two numbers as a fraction of 100. In other words, the percentage tells us how one number relates to another. If we know that number A is 25% of number B, we know that A to B is like 25 is to 100, or, after one more transformation, like 1 to 4, i.e., A is four times smaller than B. This is what the percentage calculator teaches; what is a percentage and how to find a percentage of two numbers. lg ( 5.89 ) ≅ 0.7701153 \text{lg}(5.89) ≅ 0.7701153 lg ( 5.89 ) ≅ 0.7701153 and lg ( 4.73 ) ≅ 0.674861 \text{lg}(4.73) ≅ 0.674861 lg ( 4.73 ) ≅ 0.674861 You can choose various numbers as the base for logarithms; however, two particular bases are used so often that mathematicians have given unique names to them, the natural logarithm and the common logarithm.lg ( 5.89 × 4.73 ) = lg ( 5.89 ) + lg ( 4.73 ) ≅ 0.770115 + 0.6748611 \text{lg}(5.89 \times 4.73) =\text{lg}(5.89) + \text{lg}(4.73) ≅ 0.770115 + 0.6748611 lg ( 5.89 × 4.73 ) = lg ( 5.89 ) + lg ( 4.73 ) ≅ 0.770115 + 0.6748611 Percentage is one of many ways to express a dimensionless relation between two numbers (the other methods being ratios and fractions). Percentages are very popular since they can describe situations that involve large numbers (e.g., estimating chances for winning the lottery), averages (e.g., determining the final grade of your course), as well as very small ones (like the volumetric proportion of NO₂ in the air, also frequently expressed by PPM — parts per million).