West Coast Inc. started September operation with $1,300 supplies. During the month of September, West Coast purchased additional $4,700 of supplies for cash. At the end of September, a physical count of supplies revealed that only $1,900 of supplies are left. The appropriate adjusting journal entry to be made at the end of the period would be O DR: Supplies Expense $2,800: CR: Supplies $2,800 O DR: Supplies Expense $4,100; CR: Supplies $4,100 DR: Supplies $6,000; CR: Cash $6,000 DR: Supplies Expense $1,900; CR: Supplies $1,900 DR: Supplies $4,700; CR: Cash $4,700