16. Rectify the following errors:

1. Depreciation provided on machinery ₹4,000 was not posted.
2. Bad debts written off ₹5,000 were not posted.
3. Discount allowed to a debtor ₹100 on receiving cash from him was not posted.
4. Discount allowed to a debtor ₹100 on receiving cash from him was not posted to discount account.
5. Bill receivable for ₹2,000 received from a debtor was not posted.