Answer: Please see answer in the explanation column
Explanation:
Account receivables = Total account - cash collections
                     $126,000 -- $93,000
                 = $33,000
Uncollectible Accounts = 20% x 33,000 = $6,600
a) Journal to record the adjustment for uncollectible accounts
Date          Account            Debit         Credit
Dec 31, 2018  Bad debts expense  $6,600 Â
Allowance for uncollectible accounts              $6,600
B) net realizable value of accounts receivable= Total Accounts Receivable - Allowance for uncollectible accounts
= $33,000 - $6,600= $26400