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2014-09-02T18:30:44+05:30

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Consumption of electricity in a day: 4 hours * {100W+100W+60W+60W]
         = 1.280 kWH
Monthly consumption = 1.28 kWH * 30 = 38.40 KWH

Cost per month = 38.4 KWH * Rs 1.20 / kWH = Rs 46.08

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