QUESTION 22 The following lots of a Commodity P were available for sale during the year. Use this information to answer the questions that follow. Beginning inventory First purchase Second purchase Third purchase Sunits at $61 15 units at $63 10 units at $74 10 units at $77 The firm uses the periodic system, and there are 20 units of the commodity on hand at the end of the year. What is the year-end inventory balance using the average cost method? Use the information provided in the table to answer this question a. $1,380 b.$1,250 c. $1,510 d.$1,375