There are 4 classes in the third grade, with an average of 45 students in each class, and each person buys 2 homework books. How many homework books should be bought in total?
三年级有4个班，平均每班有45名学生，每人买2本作业本，一共要买多少本作业本？
<gadget id="calculator">4 * 45 * 2</gadget>
<output>360</output>

<result>360</result>