Current Attempt in Progress Suppose that Amazon uses a periodic inventory system and reports the following for the month of June: (a) Compute the cost of the ending imventory and the cost of goods sold under (1) FIFO, (2) LIFO, and (3) average-cost. (Round overage cost per unit to 2 decimal places, es. 5.25 and final answers to 0 decimal places, es. 2,520) (b1) The parts of this question must be completed in order. This part will be aval able when vou complete the part above