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MGSM / 机械师对维修卡车和汽车的轮胎收取不同的价格。维修一个卡车轮胎,机械师收取 60 美元,而对维修一个汽车轮胎,机械师收取 40 美元。周四,机械师维修了 6 个卡…

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机械师对维修卡车和汽车的轮胎收取不同的价格。维修一个卡车轮胎,机械师收取 60 美元,而对维修一个汽车轮胎,机械师收取 40 美元。周四,机械师维修了 6 个卡车轮胎和 4 个汽车轮胎。周五,机械师维修了 12 个汽车轮胎,但没有维修任何卡车轮胎。机械师在收入比较高的那一天多赚了多少钱?

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