Four tube lights of 40w each are used for 6 hours daily. Find the cost of 30 days if rate is Rs 5 per KWh ?
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Power consumed by 1 tube light=40W
Power consumed by 4 tube lights=4×40=160W=0.16kW
Energy consumed by 4 tube lights each day =0.16 kW×5 h=0.8kWh
Power consumed by 1 fan =120W
Power consumed by 3 fans =3×120=360W=0.36kW
Energy consumed by 3 fans each day =0.36 kW×4 h=1.44kWh
Total electrical energy consumed per day =0.8+1.44=2.24kWh
∴ Total number of units consumed per day =2.24units
Cost of one unit=Rs.5/unit
Number of days in the month of September=30 days
∴ Electricity bill for the month of September=2.24 units×5 Rs./unit×30=Rs.336
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