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120÷(1+20%),=120÷1.2,=100(元);120-100=20(元);120÷(1-20%),=120÷80%,=150(元),150-120=30(元),20<30,所以同時賣出兩件商品是賠了;答:同時賣出兩件商品是賠了.
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