The original price of a coat is 240 yuan, and now it is sold at 20% off in the mall. How much cheaper is it?
一件上衣的原价是240元，现在商场八折销售，便宜了多少元？
<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">240 * (1/5)</gadget>
<output>48</output>

<result>48</result>