问题:A receivables ledger control account had a closing balance of $8,500. It contained a contra to the payables ledger of $400, but this had been entered on the wrong side of the control account.
  What should be the correct balance on the control account?
  A. $8,100 debit
  B. $7,700 debit
  C. $8,400 debit
  D. $8,900 debit
  答案:The correct answer is: $7,700 debit
  解析:$8,500 - (2 x $400) = $7,700.