Presenting a Multi-Echelon and Multi-Product Model for Inventory Control considering Shortages Using a Heuristic Algorithm

Table 4

Efficiency of the proposed heuristic method.

Problem	Z = optimal real value of the problem	TC = optimal integer value of the problem	% = percentage difference between the optimal real solution and optimal integer solution to the problem (%)
1	244301.3	245867.2	0.64
2	246162.7	244085.6	0.84
3	248188.5	246202.6	0.80
4	247622.5	255067.1	3.01
5	277597.1	279114.3	0.55
6	281391	281906.4	0.18
7	282395.6	285566.8	1.12
8	281966	289377	2.63
9	281116.2	290394.9	3.30
10	306972.5	314815.5	2.55
11	307402.1	316513.7	2.96
12	206642.8	205731.3	0.44
13	209231.6	210423	0.57
14	211189.3	210961.8	0.11
15	213020.4	215275	1.06
16	212720.8	218395	2.67
17	223065.9	228946.5	2.64
18	245184.9	241843.7	1.36
19	258218	256284.7	0.75
20	262500	268350.2	2.23
Average			1.52