Xinxing Toy Factory planned to produce 1,200 little monkeys and completed the task in 15 days, but the task was completed in 12 days. How many more monkeys were actually produced per day than planned?
新兴玩具厂计划生产1200只小猴，15天完成任务，结果12天就完成了任务，实际每天比计划每天多生产多少只？
<gadget id="calculator">1_200 / 12</gadget>
<output>100</output>

<gadget id="calculator">1_200 / 15</gadget>
<output>80</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<result>20</result>