简答题:(本小题满分12分) 某商品每件60元,每周卖出300件,若调整价格,每涨价1元,每周要少卖10件,已知每件商品的成本为

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(本小题满分12分)
某商品每件60元,每周卖出300件,若调整价格,每涨价1元,每周要少卖10件,已知每件商品的成本为40元,如何定价才能使利润最大?
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