Which one of the following errors affect the trial balance?
1
A bill receivable, received from P for Rs. 1,200 was found entered in the Bills Payable Day Book as Rs. 1,200.
2
A sum of Rs. 300 received from the estate of an insolvent debtor was found credited to his account which was already written off as bad.
3
Rs. 800 owed by a debtor was omitted to be included in the schedule of debtors.
4
Old machinery sold on credit for Rs. 700, was passed through the sales book.