To improve the mother river, the third grade students donated 408 yuan, and the fourth grade students donated twice as much as the third grade students. How much did the two grades donate in total?
为治理母亲河，三年级学生捐款408元，四年级学生捐款的钱数是三年级的2倍，两个年级共捐款多少元？
<gadget id="calculator">408 * 2</gadget>
<output>816</output>

<gadget id="calculator">816 + 408</gadget>
<output>1_224</output>

<result>1_224</result>