plz solve this problem with correct explanations :)

tks

31. Alfredo, a self-employed patent attorney, flew from his home in Chicago to Miami, had lunch alone at the Chicago airport, conducted business in the afternoon, and returned to Chicago in the evening. His expenses were as follows: $800 50 Airfare Airport parking (Chicago) Lunch Taxis (Miami) 40 42 What is Alfredo's deductible expense for the trip