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A What Percentage Is 9 Out of 14

## What Percentage Is 9 Out of 14

When you are working in a role where you might deal frequently with taxes (for example in accountancy or the building trade), having a quick and easy way to calculate the tax in your head is very useful. In the UK, when VAT and CIS (Construction Industry Scheme) taxes are 20%, a handy mental maths hack is to work out 10% (move the decimal point one place to the left) and then double your answer to get 20%.

### Way

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In its most literal form, percentages mean “part per hundred.” This is the expression of a fraction or ratio where the denominator is 100. The percentage became one of the most popular expressions of fractions for a reason. They illustrate proportion and completeness in a way that’s easy to understand. They also simplify the process of calculating based on a proportion. Percentages convert to decimals, which are much easier to process.

This becomes especially important when dealing with active ingredients. During COVID-19 pandemic, for instance, hand sanitizer has become hard to find. So, a lot of people began searching for ways to make it themselves. According to the Centers for Diseases Control and Prevention (CDC), hand sanitizer must comprise at least 60% alcohol to be effective. If you start off with a 99 percent alcohol solution, you can use 2/3rds of it in a mixture. The resulting hand sanitizer will be 66 percent alcohol, well within CDC parameters. If you start with a 70% commercial alcohol solution, however, the resulting mixture will be much too low. (Source: www.calculators.org)

### Example

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Let’s see this in action. Suppose you’ve read an article on the local news that says 12% of respondents prefer pineapple on a pizza. Most news articles will not provide the tabular data of surveys like this. They might, however, mention the population size of that survey. In our example, the article mentions that the surveyors interviewed 5,000 people. Without looking at the study’s data, we can determine how many people gave that answer:

Finding the difference in rates is more complex. In our second example, let’s assume that the country’s gross national product grew by 2%. This year, it grew by 2.5%, a change of 0.5 percentage points. This number seems unimpressive at first glance, but is it? Thus, we must look below the surface. How much did the percentages change? Let’s find the percentage change through the following formula: (Source: www.calculators.org)

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