The machine tool factory originally planned to produce 640 machines per month, but actually completed the annual production task 4 months ahead of schedule. How many units are actually produced per month?
机床厂原计划每月生产640台机器，实际提前4个月完成了全年的生产任务．实际每月生产多少台？
<gadget id="calculator">640 * 12</gadget>
<output>7_680</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">7_680 / 8</gadget>
<output>960</output>

<result>960</result>