Answer:
Find the detailed answer below
Explanation:
January 1     300 units at $5      $1,500
January 8     500 units at $9       $4,500
January 29 910 units at $10       $9,100
1,110 units are available at the end of the month. That means 600 units were sold
A.	Under FIFO
1.	Cost of goods available for sale:
         $1,500 + $4,500 + $9,100 = $15,100
2.   Cost of goods sold
          300 units at $5      $1,500
          300 units at $9      $2,700
           Total             $4,200
3.	Ending inventory
            200 units at $9       $1,800
            910 units at $10      $9,100
            Total              $10,900
B.	Under LIFO(Last in First Out)
1.  Cost of goods available for sale:
         $1,500 + $4,500 + $9,100 = $15,100
2.  Cost of goods sold
         600 units at $10      $6,000
         Total       $6,000
3.	Ending inventory
        310 units at $10      $3,100
       500 units at $9        $4,500
       300 units at $5        $1,500
       Total        $9,100
C.	Weighted average cost flow assumption: Cost of goods available for sale / total units
1.	Cost of goods available for sale:
      $1,500 + $4,500 + $9,100 = $15,100
2.	Cost of goods sold
       $15,100 / 1,710 = $8.83
       $8.83 x 600 = $5,298
3.	Ending inventory
        $8.83 x 1,110 = $9,801.3
Under perpetual Inventory System
Between January 9 and January 28. The prevailing price that will be used to sell the inventory will be the price at January 8($9)
1.	Cost of goods available for sale:
$1,500 + $4,500 + $9,100 = $15,100
2.  Cost of goods sold
         600 units at $9     $5,400
          Total           $5,400
3.	Ending inventory
        1,110 units at $9      $9,990
        Total            $9,990