A piece of clothing is 120 yuan, and now it is sold at a 20% discount, how much is it reduced when it is sold?
一件衣服120元，现在打八折出售的，出售时降低了多少元．
<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">120 * (1/5)</gadget>
<output>24</output>

<result>24</result>