5. West Valve Company sells industrial valves and fnuid control devices. One of the popular valves is the western, which has an annual demand of 2,000 units. The inventory handling cost is estimated to be S2. The manager has made a study of the costs involved in placing an order, and he has concluded that the average ordering cost of S20 per order. Furthermore, it takes about three weeks for an order to arrive from the supplier, and during this time the demand per week for West Valve is approximately 80. a) What is the economic order quantity (EoQ)? b) What is the reorder point (ROP)? c) What is the total annual inventory cost (carrying cost +ordering cost)? d) What is the optimal number of orders per year? e) What is the optimal number of days between any two orders? (Assume that the company works 300 days per year)