One of Uncle Zhang's inventions won a scientific and technological achievement award of 5,000 yuan, and he should pay 20% of personal income tax according to regulations. How much bonus did Uncle Zhang actually get?
张叔叔的一项创造发明得到了5000元的科技成果奖，按规定应缴纳20%的个人所得税．张叔叔实际得到奖金多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5_000 * (4/5)</gadget>
<output>4_000</output>

<result>4_000</result>