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Perpetual inventory using LIFO The following units of a particular item were available for sale during the calendar year: Jan.1Apr.19June30Sept.2Nov.15InventorySalePurchaseSalePurchase4,000unitsat$502,500units4,500unitsat$545,000units2,000unitsat$56 illustrated in Exhibit 4. Under LIFO, if units are in inventory at two or more different costs, enter the units with the LOWER unit cost first in the Inventory Unit Cost column. LIFO Method Apr. 19 June 30 June 30 Sept. 2 Sept. 2 Nov. 15 Nov. 15 Dec. 31 Balances