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設商品的進價為x元,則按標價的7折出售的賣價為0.7×1200元,可以保持5℅利潤率的賣價為(1+5℅)x元,兩個賣價相等,可列方程: (1+5℅)x=0.7×1200解方程 1.05x=840 x=800 答:商品的進價是800元.
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