The canteen bought back 3 bags of rice, 50 kg each. 2 yuan per kilogram, how much does it cost in total?
食堂买回3袋大米，每袋50千克．每千克2元，一共需要多少钱？
<gadget id="calculator">3 * 50 * 2</gadget>
<output>300</output>

<result>300</result>