Inventory costing methods-periodic method chen sales corporation uses the periodic inventory system. on january 1, 2012, chen had: 1,000 units of product a with a unit cost of $30 per unit. a summary of purchases and sales during 2012 follows:

unit units units
cost purchased sold
feb.2 400
apr.6 $32 1,800
july 10 1,600
aug.9 36 800
oct.23 800
dec.30 39 1,200

required

assume that chen uses the first-in, first-out method. compute the cost of goods sold for 2012 and the ending inventory balance at december 31, 2012, for product a.

assume that chen uses the last-in, first-out method. compute the cost of goods sold for 2012 and the ending inventory balance at december 31, 2012, for product a.

assume that chen uses the weighted-average cost method. compute the cost of goods sold for 2012 and the ending inventory balance at december 31, 2012, for product a.