Strategy for Optimizing Cost and Time of After Sales Using Integer Programming

After-sales service is a service that companies use to increase customer loyalty and trust in their products. in the handling, the company will implement two processes, namely replacement of goods or repairs. the decision to repair and replace certain items will cause problems. where the company will take optimal steps to choose to repair and replace. there are advantages and disadvantages in choosing one of these decisions. the repair process has the advantage that the cost of replacement of goods is minimal but has weaknesses in workmanship, while the replacement process has excess time but has a fairly expensive replacement cost. Continuous optimization is a way to produce results that will produce the best results that is appropriate. choices are based on variables used as decision supported. There are several methods that can be used to solve problems, one of which is Integer programming. Integer programming is a mathematical method used for optimization by maximizing or minimizing objective functions of constraints with decision variables in integers. Integer programming is chosen because it can produce replacement decisions or improvements with 0 or 1 notation. Integer programming supports decision making about replacement or repairment of returned products. The results show that the costs of the aftersales process is reduced by 12.14%, while the time is increased by 7.4%.