4. Solomon Shingles uses the aging method to estimate bad debt expense. At the beginning of the year, the company had an accounts receivable balance of $47,600 and a credit balance in the allowance for doubtful accounts of S 9,960. During the year, Solomon had credit sales of $1,248,600, and collected accounts receivable in the amount of $1,205,400. $21,200 of accounts receivable were determined to be uncollectible and written off. The company had the following analysis of accounts receivable at the end of the year: Accounts Receivable Age Amont Proportion Expected to Default S 40,800 10,600 6,200 7,200 4,800 S 69,600 1% 2% 8% 15% 30% Current 1-15 days past due 16-45 days past due 46-90 days past due Over 90 days past due Windsor has a December 31 yearend Required 1. Prepare the journal for the write-off of the accounts receivable of $21,200 2. Calculate the desired ending balance of the allowance for doubtful accounts at the end of the vear 3. Prepare the journal entry to record bad debt expense at year end