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Posted by **Mike** on Tuesday, December 7, 2010 at 12:02pm.

1. 1 hour?

2. 24 hours?

3. 1 year?

- math -
**MathMate**, Tuesday, December 7, 2010 at 1:45pm100 watt lamp running for 1 hour uses

100/1000 kilowatts for 1 hour, so it will cost

(100/1000)*1 hour *10 cents

= 1 cent.

I'll leave #2 and #3 to you.

- math -
**Steve**, Tuesday, December 7, 2010 at 2:08pm2. $0.24

3. $87.60

- math -
**MathMate**, Tuesday, December 7, 2010 at 8:12pmCorrect!

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