There is hereby levied an annual inspection fee and service charge upon each and every person operating a telephone exchange in the City in an amount equal to two percent (2%) of the gross revenues for each current year for exchange telephone transmission service rendered wholly within the limits of the City, to compensate the City for the expenses incurred and services rendered incident to the exercise of its police power, supervision, police regulation and police control of the construction of lines and equipment of said telephone company in the City. The inspection fee and charge shall be due and payable to the City on or before May 1 of each year and shall be paid into and appropriated and expended from the General Revenue Fund of the City. (Refer to Appendix A following this Code.) (1988 Code § 7-301)