My mother bought a coat, the original price was 2200 yuan, and now it only costs 20% off, how much is it cheaper than the original price?
妈妈买了一件上衣，原价2200元，现在只花了八折的钱，比原价便宜了多少钱？
<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">2_200 * (1/5)</gadget>
<output>440</output>

<result>440</result>