Li Yun's mother's monthly salary is 1,200 yuan. According to personal income tax regulations, the balance of the monthly wage income after deducting 800 yuan is subject to personal income tax at a rate of 5%. How much personal income tax should Li Yun's mother pay every month?
李芸母亲的月工资是1200元，按个人所得税规定，每月工资收入扣除800元后的余额部分，按5%的比例缴纳个人所得税，李芸的母亲每月应缴纳个人所得税多少元？
<gadget id="calculator">1_200 - 800</gadget>
<output>400</output>

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

<gadget id="calculator">400 * (1/20)</gadget>
<output>20</output>

<result>20</result>