The school built a new teaching building with 4 floors, 5 classrooms on each floor, and 12 fluorescent lamps installed in each classroom. How many fluorescent lamps are installed in this teaching building?
学校新建了一幢教学楼，共4层，每层有5间教室，每间教室里安装了12盏日光灯．这幢教学楼一共安装了多少盏日光灯？
<gadget id="calculator">4 * 5 * 12</gadget>
<output>240</output>

<result>240</result>