A company wants to determine the optimal replacement policy for its photocopier.The company does not keep photocopiers longer than 4 years.The company has estimated the annual costs for photocopiers during each of the 4 years and developed the following network representation of the problem.
Write out the LP formulation for this problem. 
Definitions:
Formal Sociology
Simmel’s theory that argues that different human interactions, once isolated from their content, can be similar in form.
Social Processes
Ongoing actions and events through which individuals and groups interact, develop, and are influenced within a society.
Interactions
Interactions are the reciprocal actions or influences that people or things have on one another, often leading to new outcomes or understandings within social contexts.
Georg Wilhelm Friedrich Hegel
A German philosopher of the late Enlightenment period whose dialectical method emphasized the progression of thesis, antithesis, and synthesis.
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