thew analysis of receivables method of costing inventory is based on the assumption that: a. the bad debt expense is recorded only when an account is determined to be worthless. b. the longer an account receivable is outstanding, the less likely that it will be collected. c. the uncollectible accounts can be estimated as a percentage of credit sales. d. the bad debt expense is recorded by estimating uncollectible accounts at the end of the accounting period.