JB Lumber Corporation is downsizing operations and has to decide which of its large saws should be sold. JB currently has four saws but only needs to keep three. All four saws have a remaining useful life of 3 years and will all have a salvage value of zero at the end of those 3 years. Also, all four saws have equal annual operating costs and output efficiency. Information related to the four saws is provided below: 
In order to maximize profits for the next three years, which machine would be most beneficial for JB to sell?
Definitions:
Correlated
When two or more variables are related in some way, with changes in one variable associated with changes in another.
Personal Spheres
Involve the distinct areas or aspects of an individual's life that are considered private and personal, often protected from external intrusion or scrutiny.
Social Coordination
The process by which individuals manage their interactions and activities with others to achieve shared goals, involving communication, joint attention, and mutual adjustment.
Preferences
Individual choices or inclinations towards certain options over others, often based on personal taste or value.
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