Whispering Company is a multiproduct firm. Presented below is information concerning one of its products, the Hawkeye. 23 Date Transaction 1/1 Beginning inventory 2/4 Purchase 2/20 Sale 4/2 Purchase 11/4 Sale Quantity Price/Cost 2,100 $16 3,100 3,600 4,100 3,300 x Your answer is incorrect. Thy again. Calculate average cost per unit. (Round answer to 4 decimal places, e.g. 2.7613.) Average-cost per unit x Your answer is incorrect. Try again. Compute cost of goods sold, assuming Whispering uses: (Round average cost per unit to 4 decimal places, e.g. 2.763 Cost of goods sold (a) Periodic system, FIFO cost flow (b) Perpetual system, FIFO cost flow (c) Periodic system, LIFO cost flow (d) Perpetual system, LIFO cost flow () Periodic system, weighted average cost flow (0) Perpetual system, moving-average cost flow