Aunt Li bought 30 boxes of drinks for 1080 yuan. After searching online, I found that the product was purchased directly from the manufacturer, and it only cost 28 yuan per box. How much did she spend?
李阿姨用1080元买了30箱饮料．上网查询后，发现该产品从厂家直接购买，每箱只需28元．她多花了多少元？
<gadget id="calculator">28 * 30</gadget>
<output>840</output>

<gadget id="calculator">1_080 - 840</gadget>
<output>240</output>

<result>240</result>