एक पुस्तक की 12 प्रतियां 1800 रुपये में बेचने पर 3 प्रतियो के लागत मूल्य के बराबर लाभ हुआ , तो एक प्रति का लागत मूल्य क्या था
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5
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112.5
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bhai ye answer thik hai agar problem hai to bataana
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