Jiaxin Supermarket sold 12 boxes of Yili milk and 23 boxes of Jindian milk today, and each box is 24 bottles. How many jars of milk did Jiaxin Supermarket sell in total on this day?
嘉欣超市今天卖出伊利牛奶12箱，金典牛奶23箱，每箱都是24甁．嘉欣超市这天共卖出多少甁牛奶？
<gadget id="calculator">12 * 24</gadget>
<output>288</output>

<gadget id="calculator">23 * 24</gadget>
<output>552</output>

<gadget id="calculator">288 + 552</gadget>
<output>840</output>

<result>840</result>