The students donated to the Ya'an earthquake-stricken area. There are three classes in the fourth grade, with an average donation of 280 yuan per class; there are four classes in the fifth grade, with an average donation of 308 yuan per class. How much is the total donation for the two grades?
同学们为雅安地震灾区捐款．四年级有三个班，平均每班捐款280元；五年级有四个班，平均每班捐款308元．两个年级一共捐款多少元？
<gadget id="calculator">308 * 4</gadget>
<output>1_232</output>

<gadget id="calculator">280 * 3</gadget>
<output>840</output>

<gadget id="calculator">1_232 + 840</gadget>
<output>2_072</output>

<result>2_072</result>