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An electric bulb of 60 Watts 250 volts is connected to a
source of 250 V a.c. mains. The bulb is burned for 100 days
at the rate of 5 hours per day. What is the total cost of
electricity consumed if the cost of one unit is Rs.2?
1 Rs.10
2 Rs.30
3 Rs.60
4 Rs.100
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UPSC 
