Formulation as a Linear Programming Problem :
The formulation as a LPP model involves the following basic steps :
1.     Find the key decision to be made from the study of the problem, i.e. look for variables.
2.     Identify the variables and assign them symbols as X1, X2, X3 ……… etc.
3.     State the feasible alternative which generally in a given situation is non negativity condition.
4.     Identify the constraints or restrictions in the problem and express them as linear equations or inequalities which are linear functions of the unknown variables.
5.     Identify the Objective function which is to be optimized (maximized or minimized) and represent it as a linear function in terms of unknown variables.
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