franchise fee and/or development fee for each new restaurant or territory. The terms of the international agreements may vary significantly from our domestic agreements. Franchise fees also include advertising fees paid by domestic franchisees to our system-wide marketing and advertising fund and management fees paid by certain domestic franchisees for supervisory and administrative services that we perform.
Restaurant Cost of Sales. Restaurant cost of sales consists of food and beverage costs of which approximately half relates to beef costs.
Restaurant Labor Expenses. Restaurant labor expenses include all direct and indirect labor costs incurred in operations except for profit-sharing incentive compensation expenses earned by our restaurant managing partners and market partners. These profit-sharing expenses are reflected in restaurant other operating expenses. Restaurant labor expenses also include share-based compensation expense related to restaurant-level employees.
Restaurant Rent Expense. Restaurant rent expense includes all rent, except pre-opening rent, associated with the leasing of real estate and includes base, percentage and straight-line rent expense.
Restaurant Other Operating Expenses. Restaurant other operating expenses consist of all other restaurant-level operating costs, the major components of which are utilities, supplies, local store advertising, repairs and maintenance, equipment rent, property taxes, credit card fees and general liability insurance. Profit-sharing incentive compensation expenses earned by our restaurant managing partners and market partners are also included in restaurant other operating expenses.
Pre-opening Expenses. Pre-opening expenses, which are charged to operations as incurred, consist of expenses incurred before the opening of a new restaurant and are comprised principally of opening team and training team compensation and benefits, travel expenses, rent, food, beverage and other initial supplies and expenses. On average, over 70% of total pre-opening costs incurred per restaurant opening relate to the hiring and training of employees. Pre-opening costs vary by location depending on many factors, including the size and physical layout of each location; the number of management and hourly employees required to operate each restaurant; the availability of qualified restaurant staff members; the cost of travel and lodging for different geographic areas; the timing of the restaurant opening; and the extent of unexpected delays, if any, in obtaining final licenses and permits to open the restaurants.
Depreciation and Amortization Expenses. Depreciation and amortization expenses ("D&A") include the depreciation of fixed assets and amortization of intangibles with definite lives, substantially all of which relates to restaurant-level assets.
Impairment and Closure Costs. Impairment and closure costs include any impairment of long-lived assets, including property and equipment, operating lease right-of-use assets and goodwill, and expenses associated with the closure of a restaurant. Closure costs also include any gains or losses associated with a relocated restaurant or the sale of a closed restaurant and/or assets held for sale as well as lease costs associated with closed or relocated restaurants.
General and Administrative Expenses. General and administrative expenses ("G&A") are comprised of expenses associated with corporate and administrative functions that support development and restaurant operations and provide an infrastructure to support future growth including certain advertising costs incurred. G&A also includes legal fees, settlement charges and share-based compensation expense related to executive officers, support center employees, and market partners, and the realized and unrealized holding gains and losses related to the investments in our deferred compensation plan.
Interest Income (Expense), Net. Interest income (expense), net includes earnings on cash and cash equivalents reduced by interest expense on our debt or financing obligations including the amortization of loan fees.
Equity Income from Unconsolidated Affiliates. As of September 24, 2019 and September 25, 2018, we owned a 5.0% to 10.0% equity interest in 24 domestic franchise restaurants. Additionally, as of September 24, 2019 and September 25, 2018, we owned a 40% equity interest in four non-Texas Roadhouse restaurants as part of a joint venture agreement with a casual dining restaurant operator in China. Equity income from unconsolidated affiliates represents our percentage share of net income earned by these unconsolidated affiliates.