Uncle Wang paid a personal income tax of 18 yuan in March 2013. According to national regulations, the part of personal income exceeding 3,500 yuan and less than 5,000 yuan is subject to 3% personal income tax. So how much is Uncle Wang’s income this month?
王叔叔2013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3%的个人所得税，那么王叔叔这个月的收入是多少元呢？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">18 / (3/100)</gadget>
<output>600</output>

<gadget id="calculator">600 + 3_500</gadget>
<output>4_100</output>

<result>4_100</result>