All banks pay or charge interest on money and this is defined in terms of a percentage of the amount being deposited or borrowed.
Most shops have to add taxes to the basic prices and may also offer sales defined in terms of percentage reductions.
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you would find percentages in cooking sale prices grades
Most shops. There will be [sales or value added] tax added. Also, discounts will usually be expressed in percentages. Schools: your test results.
There are infinitely many bell curves and you need to have the distribution parameters to find percentages.
They are all real numbers. All fractions can be expressed as percentages but not all percentages can be represented as fractions.