Xiao Ming, his father and mother are going to visit grandma's house. The train fare is 29.8 yuan, half price for children, how much is the round-trip transportation fee?
小明和爸爸、妈妈要去奶奶家串门．火车票价是29.8元，儿童半价，往返交通费要用多少钱？
<gadget id="calculator">29.8 * 2</gadget>
<output>59.6</output>

<gadget id="calculator">29.8 / 2</gadget>
<output>14.9</output>

<gadget id="calculator">59.6 + 14.9</gadget>
<output>74.5</output>

<gadget id="calculator">74.5 * 2</gadget>
<output>149</output>

<result>149</result>