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You can use it to figure out many things. One example would be to figure out how much a sale item will save you. Say your item is $25 but is on sale for 5 percent off. take 25 and minus 5 then hit the percent key. Another example would be for sales tax. If your tax is 5 percent and your buying something for $25 take the 25 and times it by 5 and hit the percent key. That will tell you how much to add to the $25

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Q: When is the percentage key used on a calculator?
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