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suppose a house there are two bulbs of 40 w each, two fans of 100w each. All of them are used
for two hours a day. Find the cost of electric energy used in 30 days at Rs 3.00 per unit.
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Answer:
two bulbs total energy used=40+40=80
two fans total energy used=100+100=200
total energy of bulbs and fans=200+80=280
1unit=3Rs
280w=280×3=840Rs
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