A guest become ill and was unable to stay the entire week. A refund was issued in the amount of $1,000. What account was affected?

To determine the account that was affected, we need to consider the nature of the refund. In this case, since a guest became ill and was unable to stay for the entire week, it is likely that the refund was issued for the accommodation charges or fees.

In a typical accounting system for a lodging establishment, the account affected by a refund of this nature would usually be the "Accounts Receivable" or "Guest Receivables" account. This account represents the money owed to the establishment by guests for their stays. When a refund is issued, the amount owed by the guest is reduced, and thus the "Accounts Receivable" account is credited (decreased).

So, in this situation, the "Accounts Receivable" account would be affected by the refund issued to the guest. Keep in mind that this is a general explanation, and the specific account affected may vary depending on the accounting practices and systems used by the specific lodging establishment.