Question 3: The material DX is used uniformly throughout the year. The data about annual requirement (demand), ordering cost and holding cost of this material is given below: Annual requirement: 3,200 units Ordering cost: $20 per order Holding cost: $0.65 per unit a. Determine the economic order quantity (EOQ) of material DX using above data. b. Compute the number of orders to be placed per year, annual ordering cost, annual holding cost and combined annual ordering and holding cost. If the delivery takes four working days, determine the reorder point (ROP) C