Piper owns a vacation cabin in the tennessee mountains. without considering the cabin, she has gross income of $65,000. during the year, she rents the cabin for two weeks for $2,500 and uses it herself for four weeks. the total expenses for the year are $10,000 mortgage interest; $1,500 property tax; $2,000 utilities, insurance, and maintenance; and $3,200 depreciation. what effect does the rental of the vacation cabin have on piper’s agi?