The mall opens at 8:00 am and closes at 17:00 pm every day. The mall sells a total of 72 refrigerators a day. How many refrigerators are sold per hour on average?
商场每天上午8：00开门，下午17：00关门，商场一天共卖出冰箱72台，平均每小时卖出几台冰箱？
<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<result>8</result>