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設定價X元 90%x-75%x=20-(-25) 15%x=45 0.15x=45 x=45/0.15=300 所以定價為300元!(你問題的答案) 成本也可以算出來 設成本為y元 90%x=y+20 0.9*.300=y+20 y=270-20=250 成本250元.
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