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They help when you shop, so if there's a discount on something, you can figure out what it's new price will be. For example, if a 20 dollar item is discounted 10%, you know that 10% of 20 is 2, and so you take 2 away from 20 and the new cost of your 20 dollar item is $18.

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14y ago
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Q: Uses of percentages
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