Xiaoming's father's monthly salary is 2,100 yuan. According to the relevant regulations on personal income tax, the portion exceeding 2,000 yuan has to pay 5% of the 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2100元，按照个人所得税的有关规定，超过2000元部分要缴纳的个人所得税5%，那么小明爸爸月工资应缴纳所得税多少元．
<gadget id="calculator">2_100 - 2_000</gadget>
<output>100</output>

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

<gadget id="calculator">100 * (1/20)</gadget>
<output>5</output>

<result>5</result>