The mixed integer model developed in this research and shown in
(3) to (11) is an NP-hard type problem. The developed proposed model
is based upon the model studied in Kang et al [27]. Due to the fact that
this is an NP-hard type problem we cannot find an exact solution for
that and hence we develop two meta-heuristic algorithms, GA and SA,
in this study. Thereafter, small-sized problems are solved using these
meta-heuristic approaches and compare results with the branch and
bound method.