The following lots of a particular commodity were available for sale during the year 8 units at $47 Beginning inventory First purchase Second purchase Third purchase 19 units at $52 20 units at $26 15 units at $64 The firm uses the periodic system, and there are 26 units of the commodity on hand at the end of the year. What is the ending inventory balance at the end of the year rounded to nearest dollar according to the average cost method? Do not round intermediate calculations. a. $1,312 b. $1,193 c. $1,222 d. $1,246