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(a) Potential difference , V = 200 V .
Power of bulb , P = 100 W .
We need to find the resistance of the bulb.
We know ,
Power ,
(b) Now , we need to find the electric energy consumed by 3 bulbs in 10 hours.
(c) Now, it is given that cost of one unit is 6.50 .
Therefore , total cost ,