The original price of a coat is 160 yuan, how much is the price after the 20% discount?
一件上衣原价是160元，打八折以后的价钱是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<result>128</result>