What are the uses of percentages?
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