I cant figure out how I got these wrong.

Inventory Purchases Sales Dec. 1 2,500 units at $38 Dec. 10 1,250 units at $40 Dec. 12 1,750 units Dec. 20 1,125 units at $42 Dec. 14 1,500 units Dec. 31 750 units a. Assuming that the perpetual Inventory system is used, costing by the LIFO method, determine the cost of goods sold for each sale and the inventory balance after each sale, presenting the data in the form Illustrated in Exhibit 4. Under LIFO, If units are in Inventory at two different costs, enter the units with the HIGHER unit cost first in the cost of Goods Sold Unit Cost column and LOWER unit cost first in the Inventory Unit Cost column. Schedule of Cost of Goods Sold UFO Method Prepaid Cell Phones Date Quantity Purchases Unit Purchases Total Cost of Goods Sold Unit Purchased Cost of Goods Sold Quantity Sold Inventory Inventory Unit Cost Inventory Total Cost Cost Total Cost Quantity Cost Cost Dec. 1 2.800 38 95,000 Dec 1.250 40 10 50,000 2.500 95.000 1.250 40 50,000 Dec 12 360 45 50,000 1.110 X 18 42,180 x 1.390 X IN $2,20 X 1,500 57.000 Dec 14 Dec 20 390 X 14,830 x 1.125 42 47.250 390X 3 14,820 X 1.125 42 47.250 Dec 31 750 42 31.500 390 X 140 x 30 X 47 15,120 x Dec 31 Balances 191310 X 29.940 X