Answer:
$6,500
Explanation:
First In First out (FiFO) is an Inventory method which determines the inventory value and it requires that the unit purchased first will be sold first.
                    Units   Cost      Value     Balance
Beginning Inventory    3,700    $5       $18,500    $18,500
February           Â
Purchases            5,700   $4       $22,800    $41,300
March           Â
Purchases            2,700   $6       $16,200    $57,500
Sale                 -1,300   $5       ($6,500)    $51,000
Cost of Goods sold is the cost of sold units on the basis of FIFO inventory costing method.