An aging analysis of Accustart Limited's accounts receivable at December 31, 2021 and 2020, showed the following: Additional information: 1. At December 31,2020 , the unadjusted balance in Allowance for Doubtful Accounts was a credit of $8,400. 2. In 2021, $42,400 of accounts were written off as uncollectible and $3,200 of accounts previously written off were recovered. Prepare an aging schedule to calculate the estimated uncollectible accounts at December 31,2020 and 2021 . Note that the estimated percentages uncollectible are the same for both years. Total estimated allowance balance at Dec. 31, 2020 : Total estimated allowance balance at Dec, 31, 2021: (b) The parts of this question must be completed in order. This part will be avalable when you complete the part above. (c) The parts of this question must be completed in order. This part will be available when you complete the part above. (d) The parts of this question must be completed in order. This part will be available when you complete the part above. (e) The parts of this question must be completed in order. This part will be available when you complete the part above. An aging analysis of Accustart Limited's accounts receivable at December 31, 2021 and 2020, showed the following: Additional information: 1. At December 31,2020 , the unadjusted balance in Allowance for Doubtful Accounts was a credit of $8,400, 2. In 2021, $42,400 of accounts were written off as uncollectible and $3,200 of accounts previously written off went recovered. Prepare an aging schedule to calculate the estimated uncollectible accounts at December 31,2020 and 2021. Note that the estimated percentages uncollectible are the same for both years: Total estimated allowance balance at Dec. 31, 2020: Total estimated allowance balance at Dec. 31, 2021 : Total estimated allowance balance at Dec. 31, 2021