Since 2011, the personal income tax standard means that the part of the wages exceeding 2,000 yuan will be taxed at 20%. Teacher Li's monthly salary is 2,500 yuan, so how much tax should Teacher Li pay every month?
自2011年起个人所得税标准即工资超过2000元的那部分按20%缴纳税金．李老师每月工资是2500元，那么李老师每月应缴纳税金多少元．
<gadget id="calculator">2_500 - 2_000</gadget>
<output>500</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">500 * (1/5)</gadget>
<output>100</output>

<result>100</result>