400W of power use in the refrigerator is allowed to run 10hr per day. What is the cost of energy to operate it for 30 days at Rs.4.00per Kwh
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Given
P=400kWh
t=10×30=30h
Now
E=P×t
=400×300
=120000Wh
=120kWh
Again
cost of 1kWh=Rs 4.00
cost of 120kWh=4×120=Rs 480
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