How do I find percent off problems?

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I have $20. I buy a book on sale that is originally $15.50. It was 20% off. What was the change I got back after I paid the sale price?

Aug 27th, 2015

to find the change, first find 20% of $15.50

which is $3.1

So

He paid the price for book which is 15.50 - 3.1 = $12.4

And he received $20 - $12.4 = $7.6

Hence you receive $7.6 as change

Aug 27th, 2015

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Aug 27th, 2015
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