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MGSM / 约翰尼拿了 20 美元的零用钱,又在这基础上加了 10 美元。然后他将这笔钱用于投资,一年内涨到了原来的三倍。一年后他有多少钱?

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约翰尼拿了 20 美元的零用钱,又在这基础上加了 10 美元。然后他将这笔钱用于投资,一年内涨到了原来的三倍。一年后他有多少钱?

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