A class with 49 students goes boating on the East Lake during the spring outing. If each small boat takes three people and the rent is 31 yuan, and each big boat takes five people and the rent is 48 yuan, then how much is the rent for the class at least?
某班级共49人，春游时到东湖划船，如果每只小船坐三人，租金31元，每只大船坐五人，租金48元，那么该班至少要花租金多少元．
<gadget id="calculator">48 * 8</gadget>
<output>384</output>

<gadget id="calculator">31 * 3</gadget>
<output>93</output>

<gadget id="calculator">384 + 93</gadget>
<output>477</output>

<result>477</result>