The following lots of Commodity Z were available for sale during the year. The firm uses the periodic inventory system, and there are 26 units of the commodity on hand at the end of the year. What is the ending inventory balance of Commodity Z using the weighted average cost method? Do not round intermediate calculations. Round your answer to the nearest whole dollar. a. $1,288 X b. $1,290 c. $1,182 d. $1,274