At the end of the current year, Accounts Receivable has a balance of $600,000; Allowance for Doubtful Accounts has a credit balance of $3,500; and net sales for the year total $3,000,000. Bad debt expense is estimated at 1/2 of 1% of net sales. Determine (a) the amount of the adjusting entry for uncollectible accounts; (b) the adjusted balances of Accounts Receivable, Allowance of Doubtful Accounts; and Bad Debt Expense; and (c) the net realizable value of accounts