The current price of a TV in Huadi Plaza is 2,000 yuan, which is 20% lower than the original price. How much is the reduction?
华地广场一台电视机现价2000元，比原价降低了20%，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_000 / (4/5)</gadget>
<output>2_500</output>

<gadget id="calculator">2_500 - 2_000</gadget>
<output>500</output>

<result>500</result>