The production team planned to produce 3,960 parts in 15 days, but actually completed the task in 12 days. How many more parts were actually produced per day than planned?
生产小组计划15天生产零件3960个，实际12天就完成了任务，实际每天比计划多生产零件多少个？
<gadget id="calculator">3_960 / 12</gadget>
<output>330</output>

<gadget id="calculator">3_960 / 15</gadget>
<output>264</output>

<gadget id="calculator">330 - 264</gadget>
<output>66</output>

<result>66</result>