A batch of parts has been produced for 25 days, 144 parts are produced every day, and there are still 2580 parts that have not been produced. How many parts are there in this batch?
生产一批零件，已经生产了25天，每天生产144个，还剩下2580个没有生产．问这批零件共有多少个？
<gadget id="calculator">144 * 25</gadget>
<output>3_600</output>

<gadget id="calculator">3_600 + 2_580</gadget>
<output>6_180</output>

<result>6_180</result>