The washing machine factory originally planned to produce 1,080 washing machines in 15 days, but actually completed the task in 12 days. How many more units are actually produced per day than planned?
洗衣机厂原计划15天生产洗衣机1080台，实际12天就完成任务．实际每天比计划多生产多少台？
<gadget id="calculator">1_080 / 12</gadget>
<output>90</output>

<gadget id="calculator">1_080 / 15</gadget>
<output>72</output>

<gadget id="calculator">90 - 72</gadget>
<output>18</output>

<result>18</result>