Mr. Wang earned 2,700 yuan for writing the book. According to regulations: the part after subtracting 800 yuan is subject to personal income tax at a rate of 20%. How much personal income tax should Mr. Wang pay?
王老师写书所得稿费2700元，按规定：减去800元后的部分按20%的税率缴纳个人所得税，王老师应缴纳个人所得税多少元？
<gadget id="calculator">2_700 - 800</gadget>
<output>1_900</output>

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

<gadget id="calculator">1_900 * (1/5)</gadget>
<output>380</output>

<result>380</result>