Determine the amount to be added to Allowance for Doubtful Accounts in each of the following cases and indicate the ending balance in each case. (a) Credit balance of $350 in Allowance for Doubtful Accounts just prior to adjustment. Analysis of Accounts Receivable indicates uncollectible receivables of $7,660. Amount added Ending balance $ q (b) Credit balance of $350 in Allowance for Doubtful Accounts just prior to adjustment. Uncollectible receivables are estimated at 3% of credit sales, which totaled $871,000 for the year. Amount added Ending balance $ $