In September, the planned production of 6,000 TV sets was actually completed in half a month (3/5), and in the second half of the month (November 20). How many sets were actually exceeded in September?
九月份计划生产电视机6000台，实际上半月完成计划的(3/5)，下半月完成计划的(11/20)，九月份实际超产多少台？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">11 / 20</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(3/5) + (11/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">6_000 * (23/20)</gadget>
<output>6_900</output>

<gadget id="calculator">6_900 - 6_000</gadget>
<output>900</output>

<result>900</result>