The annual demand for an item is 10,000 units. The cost to process an order is $75 and the annual inventory holding cost is 20% of item cost. The prices for the item is a function of order quantity as follows: 1-9: $2.95 per unit, 10-999: $2.50 per unit, 1000-4999: $2.30 per unit and 5000 or more: $1.85 per unit. Determine the feasible order quantity for this item (you do not need to determine the total cost for this problem).