There is a seasonal discount in the shopping mall. Chen Lin bought a piece of clothing for 80 yuan, but it turned out to be cheaper than the marked price (1/5). How much less did Chen Lin spend on this piece of clothing?
商场里换季打折，陈琳花80元买了一件衣服，结果比标价便宜了(1/5)，陈琳买这件衣服少花了多少元钱？
<gadget id="calculator">1 / 5</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">80 / (4/5)</gadget>
<output>100</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<result>20</result>