The control of inventory of physical goods is an important problem in almost every enterprise. Inventory must be maintained in agriculture, industry, retail establishment and military. There are several reasons why different sectors should maintain inventories of goods. The fundamental reasons for doing so is that it is either physically impossible or economically not viable to have goods arrive in a given system at the time when demands for them arises. Without inventories, customers have to wait until their orders are filled from a source. There are many other reasons for keeping...