# math

posted by Mike

Consumers pay for electricity by the kilowatt-hour (the amount of electricity used by a 1,000-watt appliance in one hour). If electricity costs 10cents per kilowatt-hour, what is the cost of running a 100-watt lamp for
1. 1 hour?
2. 24 hours?
3. 1 year?

1. MathMate

100 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.

2. Steve

2. \$0.24
3. \$87.60

3. MathMate

Correct!

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