High Tower is a company that occupies several office buildings. It is considering installing energy-saving light bulbs in all of its buildings. This new light bulb emits as much light as the traditional light bulbs currently in use, and the electricity required is only half of the traditional bulb. The life of this new bulb is also greatly extended
The company that produces this new bulb has obtained a patent for the new technology used in the bulb, so it has the exclusive right to produce the new bulb.
by replacing the old bulb with this new bulb when the old bulb is broken, High Tower can greatly reduce its overall lighting cost.