According to the regulations of our country: Personal income exceeding 3,500 yuan and less than 5,000 yuan should pay 3% personal income tax. Uncle Li paid personal income tax of 18 yuan last month. How much was Uncle Li’s salary last month?
按照我国的规定：个人收入超过3500元，不到5000的部分应缴纳3%的个人所得税．李叔叔上个月缴纳个人所得税18元，李叔叔上个月的工资收入是多少元？
<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">3_500 + 600</gadget>
<output>4_100</output>

<result>4_100</result>