computer is 2,400 yuan after a 20% price reduction. How much is the original price? What is the correct column
一种电脑降价20%后是2400元，原价是多少元？正确列式是多少
<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">2_400 / (4/5)</gadget>
<output>3_000</output>

<result>3_000</result>