Xiaoming's father's monthly salary is 2,800 yuan. According to the relevant regulations on personal income tax, the portion exceeding 2,000 yuan is subject to 5% personal income tax. So how much income tax should Xiaoming's father pay on his monthly salary?
小明爸爸的月工资是2800元，按照个人具所得税的有关规定，超过2000元部分要缴纳5%的个人所得税，那么小明爸爸月工资应缴纳所得税多少元．
<gadget id="calculator">2_800 - 2_000</gadget>
<output>800</output>

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

<gadget id="calculator">800 * (1/20)</gadget>
<output>40</output>

<result>40</result>