Zhang Hua wrote a collection of essays with a manuscript fee of 5,000 yuan. According to the provisions of the Individual Income Tax Law, personal income tax should be paid at 20% on the part of the manuscript fee income exceeding 800 yuan. How much tax should he pay?
张华写了一本散文集的稿费5000元，按照个人所得税法规定，稿费收入超过800元的部分按20%交纳个人所得税，他应缴税多少元？
<gadget id="calculator">5_000 - 800</gadget>
<output>4_200</output>

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

<gadget id="calculator">4_200 * (1/5)</gadget>
<output>840</output>

<result>840</result>