An Energy-Efficient Light Bulb Uses 15 W of Power for an Equivalent

question 23

Multiple Choice

An energy-efficient light bulb uses 15 W of power for an equivalent light output of a 60 W incandescent lightbulb. How much money do you save each month by using the energy-efficient lightbulb instead of the incandescent lightbulb for 6 hours a day? Assume that 1 kW·hr costs 14 cents and there are 30 days in one month.

• A) $0.39
• B) $0.76
• C) $1.51
• D) $0.57
• E) $1.13

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