3. A manager has just received a revised price schedule from a vendor. What order quantity and number of orders should the manager use in order to minimize total costs? Annual Demand is 120 units, ordering cost is $8, and annual carrying cost is $1 per unit. The price schedule is: Quantity Price 1 to 39 $14 40 to 59 $13 60 to 89 $12 90 and more $11