Uncle Xiao Li earned 2,400 yuan last month. After deducting 2,000 yuan, he pays personal income tax at a rate of 5%. How much tax should he pay?
小李叔叔上月工资2400元，扣除2000元后按5%的税率缴纳个人所得税，他应缴纳多少元税．
<gadget id="calculator">2_400 - 2_000</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>