Seo-yeon owns a condominium. In each of the following alternative situations, determine whether the condominium should be treated as a residence or a nonresidence for tax purposes.

Required:

1. Seo-yeon lives in the condo for 19 days and rents it out for 22 days.
2. Seo-yeon lives in the condo for 8 days and rents it out for 9 days.
3. Seo-yeon lives in the condo for 80 days and rents it out for 120 days.
4. Seo-yeon lives in the condo for 30 days and rents it out for 320 days.