Dad's salary this month is 4,000 yuan. According to the regulations, the part of the salary above 3,500 yuan should pay personal income tax. If the tax is paid at 3%, how much is Dad's actual income this month?
爸爸这个月工资是4000元，按规定工资在3500元以上的部分应缴纳个人所得税，如果按3%缴纳，爸爸这个月的实际收入多少元？
<gadget id="calculator">4_000 - 3_500</gadget>
<output>500</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">500 * (1/20)</gadget>
<output>25</output>

<gadget id="calculator">4_000 - 25</gadget>
<output>3_975</output>

<result>3_975</result>