For the inventory system of Model 5-4, set up a PAN comparison to investigate the average total cost resulting from each of the following ( s , S ) pairs: (20, 40) (20, 60) (20, 80) (20, 100) (40, 60) (40, 80) (40, 100) (60, 80) (60, 100) (80, 100) Run 100 replications of each case, and pick the best (lowest-cost) among these in a statistically valid way. Paste a screenshot of your PAN results (with a box/whisker plot that shows the select-the-best colorings) into your .doe f le. This comparison is from Section 1.5.5 of Law and Kelton (2000).