Xiao Ming's father and mother travel by train, and each train ticket is 225 yuan. If they both take the train to go and return, how much will it cost to buy train tickets for this trip?
小明的爸爸、妈妈乘火车去旅游，每张火车票225元，如果他们去和回来都乘火车，那么这次旅游买火车票一共要花多少钱？
<gadget id="calculator">225 * 2 * 2</gadget>
<output>900</output>

<result>900</result>