Meredith holds two jobs and attends graduate school on weekends. The education improves her skills, but does not qualify her for a new trade of business. Before going to the second job, she returns home for dinner. Relevant mileage is as follows: Home to first job 9 miles First job to second job 13 miles Home to second job 15 miles Home to university 7 miles How much of the mileage qualifies for deduction purposes?