3. Shamrock Co. provides for doubtful accounts based on 4% of gross accounts receivable, The following data are available for 2020. Credit sales during 2020 Bad debt expense Allowance for doubtful accounts 1/1/20 Collection of accounts written off in prior years (customer credit was reestablished) Customer accounts written off as uncollectible during 2020 $4,244,100 57,800 16,450 7,250 32,230 What is the balance in Allowance for Doubtful Accounts at December 31, 2020? Allowance for doubtful accounts 12/31/20 &