19. (1 point) Sonja's 12-31-16 adjusted trial balance shows accounts receivable of $2,100,000 and an allowance for doubtful accounts of $17,500. During 2016, Sonja wrote off $15,000 of receivables. During 2016, Sonja had $4,000 of subsequent collections of receivables previously written off. Sonja only records AJES once each year as of year-end 12-31. What was the balance in Sonja's allowance for doubtful accounts as of 01-01-16