K&K Distributors Ltd. provided the following purchases and sales for the month of January. K&K Distributors uses a periodic inventory system. Date Explanation Units Unit Cost Total Cost Jan. 1 Beginning inventory 200 $10 $2,000 Jan. 12 Purchase 50 12 600 Jan. 14 Sale 150 Jan. 15 Purchase 150 14 2,100 Jan. 20 Purchase 200 15 3,000 Assuming the use of the average cost formula, what is the cost of the ending inventory? a. $1,500 b. $1,925 c. $5,775 d. $6,200