a. The average aggregate inventory value is <em>$336,000.</em>
b. The number of weeks of supply that the firm has is <em>3 weeks</em>, approximately (2.69 ($336,000/$6,500,000 x 52).
c. The inventory turnover of Sapphire Aerospace for last year was<em> 19.3x.</em>
<u>Question Completion</u>:
Category        Part Number        Average           Value        Total      Category
                                               Inventory Units    per Unit      Value        Totals
Raw Materials      RM-1                20,000               $1        $20,000
 Materials             RM-2                 5,000                 5          25,000
                             RM-3                 3,000                 6           18,000
                             RM-4                  1,000                 8            8,000      $71,000
Work-in-process WIP-1                 6,000                10         60,000
                             WIP-2               8,000                 12         96,000   $156,000
Finished goods   FG-1                  1,000                65         65,000
                             FG-2                   500                88         44,000   $109,000
Total value of inventory                                               $336,000  $336,000
Inventory turnover = Cost of goods sold/Average inventory
= 19.3x ($6,500,000/$336,000)
Thus, the average inventory value is $336,000, while the inventory turnover was 19.3x.
Learn more about inventory turnover here: brainly.com/question/5701250