I don't understand how to get the perpetual moving average inventory method right

Units Units 100 Cost/Unit $1.00 400 1.10 300 300 1.30 200 200 1.35 1.60 500 800 100 300 1.80 total amount to be assigned to cost of goods sold for January and the ending inventory on January stions round the average unit cost to four decimal places and answers to the nearest cent. Cost of Goods Sold Inventory on Hand al LIFO inventory method 1,900 $ 640 al moving average inventory method 1,797 X 640 X