Manager Li's monthly salary is 3,950 yuan, and the part that exceeds 3,500 yuan needs to pay personal income tax at a rate of 3%. How much should he pay in personal income tax every month?
李经理月工资是3950元，超过3500元后的部分需要按3%的税率缴纳个人所得税，他每月应缴纳个人所得税多少元．
<gadget id="calculator">3_950 - 3_500</gadget>
<output>450</output>

<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">450 * (3/100)</gadget>
<output>27/2 = around 13.5</output>

<result>27/2 = around 13.5</result>