The selling price of a jacket is 480 yuan, which is 20% lower than the original price. How much is the price reduction?
一件上衣的售价是480元，比原价降低了20%，降价了多少元？
<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">480 / (4/5)</gadget>
<output>600</output>

<gadget id="calculator">600 * (1/5)</gadget>
<output>120</output>

<result>120</result>