Answer:
Note: The question is attached below as picture
1. Bad debt expense under percentage of sales method = Credit sales * Percentage of doubtful account
= $7,150,000 * 1%
= $71,500
2. Balance in Allowance for doubtful account under percentage of receivables method = Accounts receivable balance at end * % of doubtful account
= $1,220,000 * 5%
= $61,000
3. Age     Amount    % of Un-collectible  Estimated Balance of
                           account       uncollectible account
Not due yet   830000            2%             16600
1-30 Â Â Â Â Â Â Â Â Â 254000 Â Â Â Â Â Â Â Â Â Â Â 3% Â Â Â Â Â Â Â Â Â Â Â Â 7620
31-60 Â Â Â Â Â Â Â Â 86000 Â Â Â Â Â Â Â Â Â Â Â Â 7% Â Â Â Â Â Â Â Â Â Â Â Â 6020
61-90 Â Â Â Â Â Â Â Â 38000 Â Â Â Â Â Â Â Â Â Â Â Â 33% Â Â Â Â Â Â Â Â Â Â Â Â 12540
over 90 day   12000             68%             8160
Total                                          $50,940
The estimated balance in allowance for doubtful account at end = $50,940