Back Corporation uses the allowance method to account for uncollectible receivables. At the beginning of the​ year, Allowance for Bad Debts had a credit balance of $ 900. During the year Back wrote off uncollectible receivables of $ 2 comma 500. Back recorded Bad Debts Expense of $ 3 comma 000. What is Back's ​year-end balance in Allowance for Bad​ Debts?