A) Rs. 50
B) Rs. 60
C) Rs. 70
D) Rs. 80
Correct Answer: B
Solution :
Electrical energy \[E=p\times t\] Power of fan\[P=50\,W=\frac{50}{1000}=0.05\,kw\] \[\text{Time in hours}=\text{2}0\times \text{3}0\text{ days}=\text{6}00\text{ h}\] \[\text{E}=\text{P}\times \text{3t}=0.0\text{5}\times \text{36}00=\text{3}0\text{ kWh}\] \[\text{1kWh}=\text{Rs2}=\text{3}0\times \text{32}=\text{Rs}\,\text{6}0\]
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