The current price of a commodity is 2,400 yuan, which is 20% lower than the original price. How much is this commodity lower than the original price?
一种商品现价2400元，比原价降低了20%，这种商品比原价降低了多少元？
<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">2_400 / (4/5)</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 2_400</gadget>
<output>600</output>

<result>600</result>