Raw materials inventory transactions. Transactions related to raw materials inventory for a particular company over a four-year period appear below:(Appendix)

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Year 2 Year 3 Year 4 Year 5 Raw Materials Inventory, Jan. 1 $19,500 ? $28,700 ? Purchases of Raw Materials 87.600 $93,700 ? $98.200 Raw Materials Used. 84,300 ? 87,600 91,600 Raw Materials Inventory, Dec. 31 ? 28,700 36,000 ? a. Compute the missing items for each year. b. Suggest possible reasons for the changes observed in the Raw Materials Inven- tory account during the four-year period.