How would you advise him regarding the deductions and expenses he may be able to claim?, accounting question 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