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15 December, 23:45

Suppose the electric company charges 10 fils per kW h. How much does it cost to use a 125 watt lamp 4 hours a day for 30 days? A) AED 1.20 B) AED I. 80 C) AED 7.20 D) none of these E) AED 1.50

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  1. 15 December, 23:58
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    150 fils

    Explanation:

    Power = 125 Watt

    Time 4 hours a day

    Energy per day = Power x time per day = 125 x 4 = 500 watt hour

    Energy for 30 days = 500 x 30 watt hour = 15000 watt hour = 15 KWH

    Cost of 1 KWH = 10 fils

    Cost of 15 KWH = 15 x 10 = 150 fils
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