Math Goodies. Math is Fun - Maths Resources. What's In a Number? » Blog Archive » Percentage discounts and bonuses. Introduction By the time people reach the stage of learning about percentages, they are usually very comfortable with the idea that if you add something to something else, and then subtract the same thing, you end up with what you started: a + b – b = a When they apply the same idea to percentages, there is a tendency to do it like this:
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