This is FIFO method. So from where 50 comes from? What are the calculations?

COST OF GOODS AVAILABLE FOR SALE Total Cost Unit Cost Units Explanation Date 1,000 $10 100 Beginning inventory Jana 2,200 200 Apr. 15 Purchase 3,600 12 300 Aug. 24 Purchase 5,200 13 400 Nov 27 Purchase $12,000 1,000 Total STEP 2: COST OF GOODS SOLD STEP 1: ENDING INVENTORY Units Total Cost Units Cost Date Nov 27 400 $13 5,200 cost of goods available for sale $12,000 Aug. 24 50 12 600 Less: Ending inventory 5,800 6,200 $5,800 Cost of goods sold Total 450 Cost of $1,000 goods sold $6,200 $2,200 $3,000 Warehouse $600 $5,800 $5.200 Ending inventory l