The manager of an automobile repair shop hopes to achieve a better allocation of inventory control efforts by adopting an A-B-C approach to inventory control. Given the monthly usages in the following table, classify the items in A, B, and C categories according to their dollar usage. Item---Usage--- Unit Cost 4021---90--- $1,400 9402---300---$12 4066---30---$700 6500---150---$20 9280---10---$1,020 4050---80---$140 6850---2,000---$10 3010---400---$20 4400---5,000---$5