Xiaoming's family of three wants to travel to Kunming. The bus station is marked with 85 yuan for adults and half price for children. Xiaoming's family should prepare at least how much yuan for the trip alone.
小明一家三口要到昆明游玩，汽车站标有大人85元，小孩半价，小明家本次出游单独车费至少要准备多少元．
<gadget id="calculator">85 * 2</gadget>
<output>170</output>

<gadget id="calculator">85 / 2</gadget>
<output>85/2 = around 42.5</output>

<gadget id="calculator">170 + (85/2)</gadget>
<output>425/2 = around 212.5</output>

<gadget id="calculator">(425/2) * 2</gadget>
<output>425</output>

<result>425</result>