Replenishments) Demand per week: N(250,20)LT=4 weeks. SL=90%, and EOQ order quantity =400 Part A: Calculate the reorder point R (round it up to the nearest multiple of 10 ), the safety stock (SS) under a Q (continuous review system), and the average inventory level. [2+2+2=6pts] Part B: Suppose you switch to P (periodic review) system with review interval p=4 weeks. Use the safety stock value from Part A. What is the service level and what is the value of the order-up-to level (OUL)? 2+2=4 pts Part C: Suppose that at a review point, on-hand inventory is 200 units, and there is a backorder of 100 units. How much should you order to bring up the IP to the OUL in part B? 2 pts