In a school there are 10 electric fans each of 40 W runs for 5 hours a day, 5 electric lamps each of 60 W runs for 3 hours daily if the cost of each unit of electricity be Rs.5 then calculate the monthly cost for electricity.
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40 watts x 10 hrs = 400 watts that is 0.4Kw or 0.4 units/day. A unit is a kilowatt.
30 days x 0.4 units = 12 units total usage.
I believe the average cost of a unit in India is about Rs. 2.5 (your Rs.250 is obviously in error).
So 30 day cost = 12 x 2.5 = Rs. 30
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hope it helps you mate . have a nice day .
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