During the May Day period, Suning Appliance launched a promotional activity, and the price of one type of TV dropped to 80% of the original price, and then the selling price was 4,000 yuan. What is the original price of this type of TV?
五一期间，苏宁电器推出优惠活动，其中一种型号的电视机价格下降到原价的80%后卖价4000元，这种型号的电视机原价是多少？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<result>5_000</result>