There are 3 classes in the fifth grade of Hongxing Primary School, with an average of 45 students in each class. In the activity of showing love for the children in the disaster area, the fifth grade students donated a total of 472.5 yuan. How much is the average donation per person?
红星小学五年级有3个班，平均每班45人，在为灾区小朋友献爱心的活动中五年级学生共捐款472.5元，平均每人捐款多少元？
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">472.5 / 135</gadget>
<output>3.5</output>

<result>3.5</result>