The original price of a piece of clothing is 320 yuan, how much is the price after a 20% discount?
一件衣服原价320元，打八折后售价多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">320 * (4/5)</gadget>
<output>256</output>

<result>256</result>