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Q.

The rate of electricity in a town in Rs. 300 per unit. Calculate the cost of running an 80 – Watt fan for ten hours a day for the whole month of June

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a

Rs. 70 

b

Rs. 72 

c

Rs. 68 

d

Rs. 74 

answer is B.

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Detailed Solution

Power of the bulb = 80 W 

 Total time =10×30=300h Consumed electric energy =80×300=24kWh=24×3Rs=Rs.72

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