A TV factory planned to produce 1,080 TV sets in November (30 days), but actually produced 420 sets in the first 7 days. According to this calculation, how many sets can be over-produced in the whole month?
某电视厂11月份(30天)计划生产电视机1080台，实际前7天就生产了420台，照这样计算；全月可超产多少台？
<gadget id="calculator">420 / 7</gadget>
<output>60</output>

<gadget id="calculator">60 * 30</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 1_080</gadget>
<output>720</output>

<result>720</result>