medium · LSAT Logical Reasoning
To cut its electricity use, a company installed motion-sensor lights in all of its office hallways. Even so, the company's monthly electricity bill rose during the first month the sensors were active.
Which one of the following, if true, most helps to explain why the electricity bill increased?
- The price the utility charged per kilowatt-hour jumped by 20 percent at the start of that month.
- The company also swapped its aging desktop computers for newer, more efficient laptops.
- Several employees grumbled that the hallway lights would sometimes shut off while they were still walking through.
- The motion sensors were set to keep the lights on for ten minutes after they last detected movement.
- The new lighting was so wasteful that it consumed more power than every other device in the building combined.
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