Xiaoming's father's monthly salary is 2,000 yuan. According to the relevant regulations on personal income tax, personal income tax is paid at 5% for the portion exceeding 1,600 yuan. So how much personal income tax should Xiaoming's father pay?
小明爸爸的月工资是2000元，按照个人所得税的有关规定，超过1600元部分按5%缴纳个人所得税，那么小明爸爸应缴纳个人所得税多少元．
<gadget id="calculator">2_000 - 1_600</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>