DonCompany buys and sells widgets. On January 1, 2014, Acme had 1,200 widgets in inventory. On its balance sheet, these widgets were valued at $2,400. In 2014,Don made the following widget purchases for its inventory:

March 1:	400 widgets	$1,000 total price
June 1:	200 widgets	$600 total price
Sept. 1	500 widgets	$1,500 total price
Dec. 1:	100 widgets	$350 total price

Assume Don uses the Average Cost method of inventory valuation and sells 800 widgets on December 31, 2014 (assume no previous sales for the year). On its December 31, 2014 balance sheet, what will the ending inventory balance be? The answer is 3990, will you show the work please?