The Board of Alcohol Control shall, out of the gross revenues derived from the operation of Alcohol Beverage Control Stores, pay all salaries, costs, and operating expenses, and retain a sufficient and proper working capital. The remaining net revenues, as determined by quarterly audit, shall be distributed quarterly by the Board of Alcohol Control as follows: Fifteen (15) percent to the General Fund of Lincoln County; eighty-five (85) percent to the General Fund of the City of Lincolnton to be expended for any governmental purpose for which the City may expend tax and nontax revenues.