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Percents are used to calculate tax on EVERY store purchase,and to calculate discounts on every "special" or "bargain".If you can't calculate percents, you can't catch mistakes or avoid being cheated.
It is not uncommon to hear professional athletes state, fervently if not logically, that they are giving "110 percent."
Proportions are used in real life to determine prices of things.
There are all sorts of ways you use it in real life. One basic example is in prices of products. If something is $.98 is means 98 cents, or 98/100ths of a dollar. Also, you use percents when items are on sale. If an item is half off, that's 50%.
Believe it or not, school is a real life situation. If you are using it in school it real life for you.