Winfrey Designs had an unadjusted credit balance in its Allowance for Doubtful Accounts at December 31, 2020, of $1,800. Required: a. Prepare the adjusting entry assuming that Winfrey estimates uncollectible accounts based on an aging analysis as follows. December 31, 2020 Accounts Receivable $120,000 35,000 8,000 2,000 Age of Accounts Receivable Not due (under 30 days) 1 to 30 days past due 31 to 60 days past due Over 60 days past due Expected Percentage Uncollectible 1% 4% 10% 60%