The original price of a piece of clothing is 120 yuan, how much is it after a 20% discount.
一件衣服原价是120元，打八折后是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 * (4/5)</gadget>
<output>96</output>

<result>96</result>