According to the "Individual Income Tax Law", the part of personal monthly salary income exceeding 3,500 yuan and not exceeding 1,500 yuan is subject to personal income tax at a rate of 3%. Aunt Zhang pays 30 yuan of personal income tax per month. Her monthly income after tax is how much?
按《个人所得税法》规定，个人月工资收入超过3500元的部分，不超过1500元的按3%的税率缴纳个人所得税，张阿姨每月缴纳个人所得税30元，她每月纳税后的收入是多少元？
<gadget id="calculator">3 / 100</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">30 / (3/100)</gadget>
<output>1_000</output>

<gadget id="calculator">3_000 - 30</gadget>
<output>2_970</output>

<gadget id="calculator">1_000 + 2_970</gadget>
<output>3_970</output>

<result>3_970</result>