The following lots of a Commodity P were available for sale during the year. Beginning inventory 5 units at $61 First purchase 15 units at $63 Second purchase 10 units at $74 Third purchase 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?A. $1,380.
B. $1,375.
C. $1,510.
D. $1,250.