I’m surprized with this math question, let’s see if you could answer it:
The price of a jacket was reduced by 10%. During a special sale, the price was discounted another 10%. What was the total percentage discount from the original price of the jacket?
a. 15%
b. 19%
c. 20%
d. 21%
e. 25%
Don’t look up the answer before you have an answer in your mind! 
Answer (highlight it): b, because for example there’s a jacket that cost $100, it will first be discounted 10%, and the price will be $90. And then there’s another 10% discount, but it will be discounted from $90, not the $100, so the price is going to be $81. The total discount is 19%.
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