In 2008, the Conan family used 10,200 kWh of electricity a year, and the average monthly electricity consumption in the first half of the year was 100 kWh less than that in the second half of the year. What is the average monthly electricity consumption of Conan's house in the second half of the year?
柯南家2008年一年用电10200千瓦时，上半年的月平均用电比下半年的月平均用电少100千瓦时．柯南家下半年月平均用电为多少千瓦时．
<gadget id="calculator">100 * 6</gadget>
<output>600</output>

<gadget id="calculator">10_200 - 600</gadget>
<output>9_600</output>

<gadget id="calculator">6 + 6</gadget>
<output>12</output>

<gadget id="calculator">9_600 / 12</gadget>
<output>800</output>

<gadget id="calculator">800 + 100</gadget>
<output>900</output>

<result>900</result>