Mr. Chen received 4,000 yuan as a one-time manuscript fee, and the part after deducting 1,600 yuan was required to pay personal income tax at a rate of 20%. How much did Mr. Chen actually get?
陈老师一次得稿费4000元，按规定减去1600元后的部分按20%的税率缴纳个人所得税，陈老师实得多少元？
<gadget id="calculator">4_000 - 1_600</gadget>
<output>2_400</output>

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

<gadget id="calculator">2_400 * (1/5)</gadget>
<output>480</output>

<gadget id="calculator">4_000 - 480</gadget>
<output>3_520</output>

<result>3_520</result>