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Dennis owns an international trading company in Houston. In 2020, he paid $600 to register for a four-day course in management in San Antonio. Dennis paid $250 in airfare and lodging of $300 per night. After the course, Dennis spent the last two days sightseeing. During the trip. Dennis also paid $150 a day for meals, and $100 a day for a rental car. He bought a gift of $240 for his boss. What amount of these expenditures may Dennis deduct as business expenses? Hint: Use 4 daysights to calculate the associated business expenses