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Percent means 'out of a hundred'.

So 20% from something is "20 out of hundred of something"

Some examples:

20% of 100 = 20/100 * 100 = 20.

20% of 50 = 20/100 * 50 = 10

20% of 15 = 20/100 * 15 = 3

So percent can be written as a decimal aswell: 15% = 0.15 = 15/100

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Q: How do you get 20 percent of a number?
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