At the end of the year, Randy's Parts Co. had the following items in inventory: Item P1 P2 P3 P4 Quantity 60 40 80 70 Unit Cost $ 85 70 130 125 Unit Market Value $ 90 72 120 130 Required a. Determine the amount of ending inventory using the lower-of-cost-or-market rule applied to each individual inventory item. Ending inventory b. Provide the adjustment necessary to write down the inventory based on Requirement a. Assume that Randy's Parts Co. uses the perpetual inventory system. Adjustment to inventory by c. Determine the amount of ending inventory, assuming that the lower-of-cost-or-market rule is applied to the total inventory in aggregate Ending inventory d. Provide the adjustment necessary to write down the inventory based on Requirement c. Assume that Randy's Parts Co. uses the perpetual inventory system. Adjustment to inventory by