Response to the following problem:
A company that records credit purchases in a purchases journal and records purchases returns in a general journal made the following errors. Indicate when each error should be discovered.
1. Posted a purchases return to the Accounts Payable account and to the creditor's subsidiary account but did not post the purchases return to the Inventory account.
2. Posted a purchases return to the Inventory account and to the Accounts Payable account but did not post to the creditor's subsidiary account.
3. Correctly recorded a $4,000 purchase in the purchases journal but posted it to the creditor's subsidiary account as a $400 purchase.
4. Made an addition error in determining the balance of a creditor's subsidiary account.
5. Made an addition error in totaling the Office Supplies column of the purchases journal.