The price of a certain kind of clothes in a shopping mall is 70 yuan, how much is the price after a 20% discount.
商场某种衣服价钱是70元，打八折后价钱是多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">70 * (4/5)</gadget>
<output>56</output>

<result>56</result>