Students in 4 classes in the third grade are doing radio gymnastics. Each class has 20 people standing in each row, standing in 12 rows. How many people in the third grade are doing radio gymnastics?
三年级4个班同学做广播体操，每个班每行站20人，站了12行，三年级一共有多少人做广播体操？
<gadget id="calculator">20 * 12 * 4</gadget>
<output>960</output>

<result>960</result>