mr.liu always saves 25% of his income . when his income increases by 5% , his saving increases by $48 . find his original income.刘先生始终节省25%的收入.当他的收入增加5%,他的储蓄增加48美元.发现他原来...我素要答案（你这是百度翻译的，我不会吗？）字面就这意思啊答案设原来收入为x元((x+1/20x)-x)乘以0.25=48 x=48乘以80x=3840仅供参考 欢迎采纳 希望帮到你