12. A company uses a very small number of items in its business. The items are listed in the following table, as are their cost and annual use in units.

a. Determine the annual dollar use, and determine which appear to be the A, B, and C items.

b. Arrange the list in descending order of annual dollar use, then plot the cumulative percentage of annual dollar use versus the cumulative percentage of items.

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PART NUMBER ANNUAL USE (UNITS) COST PER UNIT PART NUMBER ANNUAL USE (UNITS) COST PER UNIT M602 W101 31,000 $ 0.10 D277 400 $3.35 5,200 10.00 R802 800 2.40 F310 1,500 0.65 D780 600 0.36 H884 F400 100,000 0.14 M029 30,000 1.18 60 255.00 B150 60,000 0.25