根据税款算收入的数学问题：王叔叔2012年3月缴纳个人所得税18元，按照国家规定，个人收入超过3500元不足5000元的部分要缴纳百分之3的个人所得税，那么王叔叔这个月的收入是多少元呢？

王叔叔既然缴了税，说明他的收入超过了3500元。先根据税款算出他超过3500元的部分：18÷3%＝600（元）

再用：600+3500＝4100（元）算出他的收入。

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