"Net profits" means a gain from the operation of a business, profession, enterprise or other activity after provision for all ordinary and necessary expenses either paid or accrued in accordance with the accounting system used by the taxpayer for Federal income tax purposes without deduction of taxes imposed by this chapter, Federal, State and other taxes based on income; and in the case of an association, without deduction of salaries paid to partners and other owners. (Ord. 66-67. Passed 12-19-66.)