A new school needs to be equipped with desks and chairs for 15 classrooms. A set of desks and chairs costs 200 yuan, and each classroom needs 30 sets. How much is the total cost?
一个新建学校需要配备15个教室的课桌椅．一套课桌椅售价200元，每个教室要配30套，一共需要多少元？
<gadget id="calculator">30 * 200 * 15</gadget>
<output>90_000</output>

<result>90_000</result>