how do you get 150 for May 5th? and also the ending inventory?

1)Calculation of Ending Inventory by FIFO Date MAY. 1 MAY. 5 MAY. 23 Units Rate Amount 7508 6000 800 10 8000 300 11 3300 Cost of Goods Available for sales 1850 17300 Ending Inventory 450 Units MAY 5 MAY, 23 150 300 10 11 1500 3300 Ending Inventory 450 4800 Cost of Goods Sold - Cost of Goods available for sale - ending inventory = 17300-4800 12500