The original price of a pair of trousers is 160 yuan, and now they are sold at a discount of 20%. The current price is much cheaper than the original price.
一条裤子原价160元，现在促销打八折出售，现价比原价便宜了多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">160 * (4/5)</gadget>
<output>128</output>

<gadget id="calculator">160 - 128</gadget>
<output>32</output>

<result>32</result>