(FIFO, LIFO, Avg. Cost) Jan. 1 Inventory 4,000 units at $20 Apr. 19 Sale 2,500 units June 30 Purchase 6,000 units at $24 Sept. 2 Sale 4,500 units Nov. 15 Purchase 1,000 units at $25 What is the cost of merchandise sold and ending inventory assuming...... Periodic; FIFO LIFO Average cost Perpetual: FIFO LIFO Average cost Work all problems out for each