Sec. 19. (a) The city-county legislative body shall perform the duties and may exercise the powers prescribed by statute for:
(1) the common council of a first class city; or
(2) the county council of the county.
(b) The city-county legislative body may exercise any power prescribed for the board of commissioners of the county by statute:
(1) to pass any ordinance; or
(2) to pass any rule or regulation prescribing a penalty.