15 (1 point) A total of $3,500 in supplies was purchased during the year. At the end of the year $820 of the supplies were left. The adjusting entry needed at the end of the year is: O debit Supplies $1,300; credit Supplies Expense $1,300 O debit Supplies Expense $2,680; credit Supplies $2,680 O debit Supplies Expense $820; credit Supplies $820 O debit Supplies $2,680; credit Supplies Expense $2,680