The three members of Xiaolin's family go on a trip, each train ticket is 142 yuan, how much is the total cost for a round trip.
小林一家三口去旅游，每张火车票142元，往返一次一共用多少元．
<gadget id="calculator">142 * 3 * 2</gadget>
<output>852</output>

<result>852</result>