11 पुस्तकों की लागत 10 पुस्तकों के विक्रय मूल्य के बराबर है। एक किताब कितने प्रतिशत लाभ पर बेची गई है ? The cost of 11 books is equal to the selling price of 10 books. At what profit percentage was one book sold?

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11 पुस्तकों की लागत 10 पुस्तकों के विक्रय मूल्य के बराबर है। एक किताब कितने प्रतिशत लाभ पर बेची गई है ? The cost of 11 books is equal to the selling price of 10 books. At what profit percentage was one book sold?






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