atkinson company's beginning inventory on january 1, 2008 consisted of 2,100 units costing $1.50 per unit. purchases during the year were as follows: quantity total cost january 15 2,500 $3,750 march 25 4,000 8,000 june 10 3,000 7,500 august 5 1,500 4,500 november 20 3,200 9,600 14,200 $33,350