After buying the bag,what percent of the $100 that he earned does Tom have left for other expenses?

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• After buying the bag,what percent of the $100 that he earned does Tom have left for other expenses?
• 英语翻译1.Many stores have some discount items.Tom notices that a store has a bag on sale.The original price of the bag is $100.On that day,the price is reduced 40%.How much money does Tom need to pay for the bag?2.After buying the bag,what percent of the $100 that he earned does Tom have left for other expenses?
• After buying the bag,what percent of the $100 that he earned does Tom have left for other expenses?要求精确,希望无误
• 已知函数f（x）满足2f（x）+f（-x）=3x+4，则f（x）=_．
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