The tax law stipulates that the part of personal income exceeding 800 yuan per month shall be levied a "personal tax adjustment", and the part exceeding 500 yuan shall be levied at a rate of 5%. Li Shuquan earned 1,200 yuan in November, how much tax should he pay?
税法规定，每月个人收人超过800元的部分要征收"个调税"，超过部分不满500元的按5%的税率征收．李叔权十一月份收人1200元，应缴纳个调税多少元？
<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>