Discussion
An occupancy sensor in a store lit 10 hours a day but occupied 2 hours saves about
Answer: B
Correct answer: 80 per cent of that room's lighting energy
\[ \frac{10-2}{10} = 80\ \mathrm{per\ cent}. \] Eight of the ten hours are lit with nobody present, and the sensor removes them. This is why stores, washrooms and meeting rooms are where sensors pay, and why fitting one in a continuously occupied space saves nothing.
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