Assume simple co. had credit sales of $247,000 and cost of goods sold of $147,000 for the period. simple uses the percentage of credit sales method and estimates that 2 percent of credit sales would result in uncollectible accounts. before the end-of-period adjustment is made, the allowance for doubtful accounts has a credit balance of $220. what amount of bad debt expense would the company record as an end-of-period adjustment?