The double discount
A $100 jacket is 40% off, and checkout takes another 20% off. Is that the same as 60% off?
$100
- You pay
- Extra at checkout
- First discount
You pay
?
Real discount
?
Make your guess to see the answer.
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Stacked discounts sound bigger than they are. Find out what you really pay.
A $100 jacket is 40% off, and checkout takes another 20% off. Is that the same as 60% off?
$100
You pay
Real discount
Make your guess to see the answer.
A percentage discount is a multiplication. 40% off means you pay 60% of the price, so $100 becomes $60. Another 20% off means you pay 80% of that new price, which is $48.
Multiply the two together: 0.6 times 0.8 is 0.48. You pay 48% of the original price, a real discount of 52%, not 60%. The second discount is smaller than it sounds because it comes off a price that already dropped.
It is the same idea behind percent change, sales tax, compound interest and exponential growth in Algebra 1 and 2.
Every one of them runs on the math and physics we teach.
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