There are 43 people in class 3 and 2, and each person donates 2 books to the school on average. How many books have they donated in total?
三2班有43人，平均每人向学校捐2本书，一共捐了多少本．
<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<result>86</result>