Infinite Taco uses the allowance method to account for uncollectible accounts receivable. Bad debt expense is calculated as a percentage of credit sales. This year, net credit sales totaled $4 million, and the bad debt percentage is 2.0%. The allowance account began with a credit balance of $50,000 and, after adjusting entries, had a closing credit balance of $40,000. What was the amount of A/R written off? Please post steps to solution, thanks!