Students in four classes in the third grade participated in the voluntary tree planting labor. They started working at 7:30 in the morning and completed the task at 1:30 in the afternoon. If a class plants 36 trees per hour, how many trees will be planted in total?
三年级四个班同学参加义务植树劳动，从早上7：30开始劳动到下午1：30就完成了任务，如果1个班每小时植树36棵，一共植树多少棵？
<gadget id="calculator">36 * 6 * 4</gadget>
<output>864</output>

<result>864</result>