Q: What is the formula to work out percentages?

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It is 100*staff costs/total costs.

Because that it s harder to work out percentages than fractions and decimals

27/50 = 54/100

Double it - to give 90 out of 100 - or 90%

Percentages are always use when comparing one number to another. With you only providing one number Percentages doesn't work very well.

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Most people work with percentages in one way or another.

work out the math

You can't

It is 100*staff costs/total costs.

Because that it s harder to work out percentages than fractions and decimals

They are smart and know everything

When working with percentages, it is best not to round during the actual work. Only when you have your final answer do you round to the nearest hundredth. e.g. 96.54

Percentages can be written as decimals, with 10% being 0.1 and 100% being 1.

27/50 = 54/100

4.1/22.20 = 18.5% approx.

No, I do not.

Double it - to give 90 out of 100 - or 90%