What are the uses of percentages?

Answer 1

There are so many uses it boggles the mind. I will list a few, and perhaps people will add to it over time. * Setting and calculating discounts on sale items at the store * Calculating sales tax * Test scores (percentage correct) * Political polling Rates, and percentage is just a rate (per 100), are useful wherever you want to express one value relative to another value. Percentages become especially useful if you want to compare groups on a fairer basis. For example, if Student A gets 18 questions out of 20 correct and Student B gets 21 questions out of 30 correct, which is the better student? Student B answered MORE questions correctly, but Student A is better because they achieved a higher PERCENTAGE of right answers (18/20=90%). Student B's score, expressed as a percentage, is lower (21/30=70%). But if I had 2 questions and answered them both correctly, I'd be better (2/2=100%)