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Answer to Q142
A man buys a book for $150, he then sells for $160. He bought the same book back for $170, then resells it again for $180.
How much did he gain or lose?
Let's assume this man has $500 in his pocket to start with (note, any amount you assume will work, we are just assuming 500).
So he bought a book for $150: at this point, he has $350 left in his pocket.
he then sells for $160: at this point he has (350+160) = $510
He bought the same book back for $170: now he has (510 - 170) = $340
hen resells it again for $180: now he has (340 + 180) = $520
He started out with $500 and at the end he has $520, that means he has made a gain of $20
Answer: He gained $20
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