According to the "Individual Income Tax Law", personal income tax should be paid at a rate of 5% on the part of personal monthly salary income exceeding 1600 yuan; Uncle Li's monthly salary is 1840 yuan, how much personal income tax should he pay to the state every month?
按《个人所得税法》规定，个人月工资收入超出1600元的部分，应按5%的税率缴纳个人所得税；李叔叔每月工资是1840元，他每月应向国家缴纳多少元的个人所得税？
<gadget id="calculator">1_840 - 1_600</gadget>
<output>240</output>

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

<gadget id="calculator">240 * (1/20)</gadget>
<output>12</output>

<result>12</result>