need help solving C

The following table contains figures on the monthly volume and unit costs for a random sample of 16 items from a list of 2,000 inventory items at a health care facility: Click here for the Excel Data File a. Develop an A-B.C classification for these items. Answer is complete and correct. a. Develop an A-B-C classification for these items. Answer is complete and correct. b. Given the monthly usages in the following table, classify the items in A, B, and C categories according to dollar usage. Answer is complete and correct. c. Determine the percentage of items in each category and the annual dollar value for each category for part b. (Enter your answers as percentages rounded to two decimal places.)