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Your utility company charges 12 cents per kilowatt-hour of electricity. How much does it cost to keep a 150-watt light bulb on for a week?

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Answer:

5 x 75 = 375w (5 bulbs added up) 1.5 x 375 = 562.5w (running for an hour and a half) 562.5/1000 x 10 = 5.525 cents. 1 Kwh is 1000w running for 1 hour.

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