Xiaohong goes to the Great Wall with her father and mother. The one-way fare is 24.5 yuan per person. How much is the round-trip transportation fee?
小红和爸爸、妈妈去长城，单程票价每人24.5元，往返交通费要多少元？
<gadget id="calculator">24.5 * 3 * 2</gadget>
<output>147</output>

<result>147</result>