David purchases a yacht solely for the purpose of entertaining real estate clients. He wishes to position himself as a high-end real estate salesperson specializing in very expensive residences and uses the yacht only for business entertainment. During 2015, his expenses for maintaining the yacht, including depreciation, were $28,000. In addition, he incurred $9,000 of catering expenses for meals he provided to business clients on the yacht. What is David's tax deduction in 2015? Explain.