valdes corporation had a credit balance in the allowance for doubtful accounts of $62,000 at 1/1/19 during 2019, it wrote off $21,400 of accounts and collected $7,800 on accounts previously written off, the amount of bad debt expense recoginzed in 2019 is $11,000. if valdes estimates at the year end that 6% accounts receivable will prove to be uncollectible what is the account receivable balance at 12/21/2019