Business Deductions, accounting homework help

An owner of an automobile body shop comes into your office for tax advice. He
has been thinking about updating his antiquated computer system so he purchased
a consumer handbook then he flew to San Francisco to visit the Apple Store to
shop for computers for his personal and business use. He wants to deduct the
trip, his food, the book, and the computer he purchased in San Francisco.
How
would you advise him regarding the deductions and expenses he may be able to
claim? Make a recommendation regarding how these expenses should be treated to
maximize his deductions. Be specific with your recommendation