Kimberly is a self-employed taxpayer. She recently spent $1,800 for airfare to travel to Italy. What amount of the airfare is deductible in each of the following alternative scenarios? (Leave no answers blank. Enter zero if applicable.)

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a. Her trip was entirely for personal purposes

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b. On the trip, she spent seven days on personal activities and three days on business activities.

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c. On the trip, she spent six days on business activities and four days on personal activities.

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d. Her trip was entirely for business purposes.