Q. In a house, three electric bulbs of 60W each for 5 hours, a heater of 1000 W for 3 hours are used daily for
30 days. Calculate the cost of energy used at the rate of Rs. 3
per unit.
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Answer:
Total units consumed hour =
1000
(60×4)+(100×2)+(2000)
=
1000
240+200+2000
=
1000
2440
KWh
=2.44KWh
Total units consumed for 5 hours a day for 30 days
=2.44×5×30=366KWh
Total monthly bill
=RS.5.50×366=Rs.2013
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