how can I show in LIFO perpetual method?

E8.18 (LO3, 5) (FIFO, LIFO, and Average-Cost Determination) Keyser Company's record of transactions for the month of April is as follows. Purchases Sales April 1 (balance on hand) 600 @ $6.00 April 3 500 @ $10.00 4 1,500 @ 6.08 9 1,300 @ 10.00 8 800 @ 6.40 11 600 @ 11.00 13 1,200 @ 6.50 23 1,200 @ 11.00 21 700 @ 6.60 27 900 @ 12.00 29 500 @ 6.79 4.500 5,300 structions a. Assuming that periodic inventory records are kept, compute the inventory at April 30 using (1) LIFO and (2) average-cost. b. Assuming that perpetual inventory records are kept in both units and dollars, determine the inventory at April 30 using (1) FIFO and (2) LIFO. c. Compute cost of goods sold assuming periodic inventory procedures and inventory priced at FIFO