一家店将某种商品按成本价提高40%后标价,元旦期间,欲打八折出售,以答谢新老顾客对本店光顾，结果获利24元
求成本价`````````````````````````````````````````````````````````````````````````````````...
求成本价 ````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````
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解：设成本价为x 。 140 %x 乘8 0%减x =15 x=200
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