Xiao Ming wants to buy a computer. The 20% discount is 400 yuan cheaper than the original price, so how much is the original price of this computer?
小明要买一台电脑．打八折后比原价便宜了400元，那么这台电脑原来的价格是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">400 / (1/5)</gadget>
<output>2_000</output>

<result>2_000</result>