The simplified solution procedures for the optimal replenishment decisions under two levels of trade credit policy depending on the order quantity in a supply chain system

Kreng and Tan [Kreng, V. B. & Tan, S. J. (2010). The optimal replenishment decisions under two levels of trade credit policy depending on the order quantity. Expert Systems with Applications 37, 5514–5522] explore the optimal replenishment decisions under two levels of trade credit policy depending on the order quantity. Their inventory model is new and interesting. However, this paper indicates that their solution procedures can be improved further. So, the main purpose of this paper is to incorporate and simplify them for Kreng and Tan (2010).