A note on inventory ordering policies of delayed deteriorating items under permissible delay in payments

Abstract

The inventory problem consists of two parts; one is the modeling which can provide insight to solve the inventory problem and the other is the solution because the accuracy of the solution procedure can help and simplify the implementation of the inventory. In other words, the modeling and the solution procedure to the inventory problem are equally important. Musa and Sani (2012) explore an EOQ model for non-instantaneous deteriorating items with permissible delay in payments. However, some of their inventory models are incorrect which will result in some of their solution procedures are invalid. In addition, the solution procedure in Musa and Sani (2012) seems easy to cause misunderstandings. Consequently, the main purpose of this paper is twofold:This paper reestablishes valid inventory models for Musa and Sani (2012). From the practical view, we assumed that the demand rate during the period before the deterioration sets in is bigger than the demand rate after the deterioration sets in.This paper adopts the calculus approach to present accurate and reliable solution procedure for Musa and Sani (2012).