In 2018, sheridan company had net credit sales of $1124400. on january 1, 2018, allowance for doubtful accounts had a credit balance of $27000. during 2018, $41400 of uncollectible accounts receivable

In 2018, sheridan company had net credit sales of $1124400. on january 1, 2018, allowance for doubtful accounts had a credit balance of $27000. during 2018, $41400 of uncollectible accounts receivable were written off. past experience indicates that the allowance should be 10% of the balance in receivables (percentage of receivables basis). if the accounts receivable balance at december 31 was $376400, what is the required adjustment to the allowance for doubtful accounts at december 31, 2018?