Xiaoxiao went to Guangzhou with her father and mother. The one-way fare is 78.5 yuan per person, half price for children. How much is the round-trip transportation fee?
笑笑随爸爸和妈妈到广州玩，单程票价每人78.5元，儿童半价，往返交通费要多少钱？
<gadget id="calculator">78.5 * 2</gadget>
<output>157</output>

<gadget id="calculator">78.5 / 2</gadget>
<output>39.25</output>

<gadget id="calculator">157 + 39.25</gadget>
<output>196.25</output>

<gadget id="calculator">196.25 * 2</gadget>
<output>392.5</output>

<result>392.5</result>