In a probability-proportional-to-size sample with a sampling interval of $10,000, an auditor discovered that a selected account receivable with a recorded amount of $5,000 had an audit amount of $2,000. The projected error of this sample was
  A. $8,000
  B. $3,000
  C. $6,000
  D. $4,000
  Answer:C
  C is corrent because for accounts with a book value less than the sampling interval, one must first calculate a tainting percentage which is equal to: [(Recorded amount - Audit amount)/Recorded amount]. The tainting percentage is multiplied by the sampling interval to determine projected error. In this question the tainting percentage is 60% [($5,000 - $2,000)/$5,000]. The projected error is calculated as 60% times the sampling interval, or .60 x $10,000 = $6,000.