An aging of a company's accounts receivable indicates that $10400 are estimated to be uncollectible. If Allowance for Doubtful Accounts has a $3080 debit balance, the adjustment to record bad debts for the period will require a debit to Allowance for Doubtful Accounts for $13480. credit to Allowance for Doubtful Accounts for $10400. debit to Bad Debt Expense for $13480. debit to Bad Debt Expense for $10400