4. At the end of the current year, Accounts Reccivable has a balance of $550,000: Allowance for Doubtful Accounts has a credit balance of $5,500; and sales for the year total $2,500,000. An analysis of receivables estimates uncollectible receivables as $25,000. Determine (a) the amount of the adjusting entry for bad debt expense; (b) the adjusted balances of Accounts Receivable, Allowance for Doubtful Accounts, and Bad Debt Expense; and (c) the net realizable value of accounts receivable