One lap of the sports track is 400 meters, and Uncle Wang insists on running two and a half laps every day. How many meters did he run in total in 4 days?
运动场跑道一圈是400米，王叔叔每天坚持跑2圈半．他4天一共跑了多少米．
<gadget id="calculator">400 * 2.5 * 4</gadget>
<output>4_000</output>

<result>4_000</result>