57. क्रय मूल्य पर 40% का लाभ विक्रय मूल्य पर कितने प्रतिशत लाभ के बराबर है? (A) 28-% 7 (B) 17% के (C) 20% (D) 15-% 7.
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- (A) 28-%7
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it is a right answer
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