Yongxin Agricultural Tool Factory produced a batch of agricultural tools. It was originally planned to be completed in 15 days, but actually produced 280 pieces per day. Not only did it complete the task in 12 days, but it also exceeded the quota by 360 pieces. How many pieces were originally planned to be produced per day?
永新农具厂生产一批农具，原计划15天完成，实际每天生产280件，不仅12天完成了任务，还超额了360件．原计划每天生产多少件？
<gadget id="calculator">280 * 12</gadget>
<output>3_360</output>

<gadget id="calculator">3_360 - 360</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 / 15</gadget>
<output>200</output>

<result>200</result>