550 yuan can help one out-of-school child complete primary school, and the donation of five classes in the third grade can just help four out-of-school children. How much is the average donation for each class?
550元可以帮助一名失学儿童完成小学学业，三年级5个班的捐款正好能帮助4名失学儿童，平均每个班捐了多少元？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">550 * (4/5)</gadget>
<output>440</output>

<result>440</result>