The students donated to the Hope Project. Every 400 yuan can help one out-of-school child. The 4 classes saved 2 children in total. How much is the average donation for each class?
同学们为希望工程捐款，每400元可以救助一名失学儿童，4个班一共救助了2名儿童，平均每个班捐款多少元？
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">400 * (1/2)</gadget>
<output>200</output>

<result>200</result>