A piece of clothing in a shopping mall sells for 240 yuan, which is 20% cheaper than the original price. How much is it cheaper?
商场里一件衣服卖240元，比原价便宜了20%，便宜了多少元？
<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">240 / (4/5)</gadget>
<output>300</output>

<gadget id="calculator">300 - 240</gadget>
<output>60</output>

<result>60</result>