_16. MRP is a computer-based information system designed to handle independent demand inventories _17. The idea of back-ordering is that for some items it is too costly to maintain an inventory. 18. If Quantity Discount Inventory models are considered, the purchase cost (P*D) should be added to the total inventory cost. _19. The number of orders placed in a year in an EOQ system is given by the ratio of EOQ to annual demand. _20.

TRUE AND FALSE. PLEASE EXPLAIN WHY. THANKS!