एक दुकानदार ने 400 मे 100 किताब खरीदी l वह उनसे 50 लाभ कमाना चाहता है बताइए वह प्रत्येक किताब को किस दर से बेचे l
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in 10 rupees because if we sell one book in ten rupees then 5 books we get 50 rupees
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