By selling 200 books, a man gains the selling price of 400 books. Find his gain percent
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50 percent is his gain
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book selled =200
price of book get back=400
suppose,if he purchase 200 books in 100 rupees and he get price of 400 books . means he get 200 rupees
so, gain percantage = 50%
price of book get back=400
suppose,if he purchase 200 books in 100 rupees and he get price of 400 books . means he get 200 rupees
so, gain percantage = 50%
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