The original price of a coat is 200 yuan, and now it is sold at a 20% discount. How much is it cheaper than the original price?
一件上衣原件200元，现在打八折出售，现在比原价便宜多少元？
<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">200 * (1/5)</gadget>
<output>40</output>

<result>40</result>