the air tickets are $250 each. a single-bed hotel room costs $100/ night but he has to get a bigger hotel room because of his family that is $200/ night. meals for only himself cost $50/ day, and he has to rent a car for 4 days to commute between the hotel and convention center for meetings which cost him $40/ day. he keeps a mileage log that substantiates 100% business use. while in las vegas, he hung out with some clients and paid $200 for lunch in a conference room with them while reviewing a contract. he keeps all receipts, invoices, etc necessary to document business use. how much of his trip is deductible?