How to find LIFO and FIFO?

Units Sold at Retail Units Acquired at Cost 640 units @ $55.00 per unit 420 units @ $52.00 per unit 220 units @ $37.00 per unit 820 units @ $85.20 per unit Date Activities Jan 1 Beginning inventory Feb. 10 Purchase Mar. 13 Purchase Mar. 15 Sales Aug. 21 Purchase Sept. 5 Purchase Sept. 10 Sales Totals 140 units @ $60.00 per unit 540 units @ $56.00 per unit 680 units @ $85.00 per unit 1,500 units 1,960 units