Master Liu's monthly salary is 4,000 yuan. According to the personal income tax law: the balance after deducting 3,000 yuan from monthly income is subject to personal income tax at a rate of 5%. How much personal income tax should Master Liu pay every month?
刘师傅的月工资是4000元，如果按个人所得税法规定：每月收入扣除3000元后的余额部分按5%的比例缴纳个人所得税．刘师傅每月应缴纳个人所得税多少元？
<gadget id="calculator">4_000 - 3_000</gadget>
<output>1_000</output>

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

<gadget id="calculator">1_000 * (1/20)</gadget>
<output>50</output>

<result>50</result>