Teacher Wang published an article in a magazine last month and received 800 yuan in manuscript fees. According to regulations, he must pay 20% personal income tax. How much manuscript fee did Teacher Wang actually get?
王老师上个月在杂志上发表了一篇文章，获得800元稿费，按规定必须交20%的个人所得税，王老师实际获得多少元稿费？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">800 * (1/5)</gadget>
<output>160</output>

<gadget id="calculator">800 - 160</gadget>
<output>640</output>

<result>640</result>