Uncle Li is paid 6,000 yuan for a manuscript, and the part exceeding 1,800 yuan is required to pay personal income tax at a rate of 4%. How much personal income tax should he pay?
李叔叔一次稿酬为6000元，按规定超出1800元的部分按4%的税率缴纳个人所得税，他应缴纳多少元的个人所得税？
<gadget id="calculator">6_000 - 1_800</gadget>
<output>4_200</output>

<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">4_200 * (1/25)</gadget>
<output>168</output>

<result>168</result>