In Exercise 6-11, investigate whether taking inventory at the beginning of each day is necessarily the best policy by adding the inventory-evaluation interval (currently set at one day) to the optimum-seeking variable mix, and allow OptQuest to vary it (continuously) between a half day and 5 days, as well as simultaneously allowing s and S to vary as in Exercise 6-11. If you use Model 05-04.doe as a base, you’ll need to change Evaluation Interval from an Expression to a Variable so OptQuest can get at it.