The rate of the tax imposed by CCC 5.06.010 shall be five-tenths of one percent of the selling price (in case of the sales tax) or value of the article used (in the case of the use tax); provided, however, that if the sales or use tax imposed under this chapter is equal to or greater than the rates imposed under RCW 82.14.030(2) as authorized by Laws of 1982, 1st Extraordinary Session, Chap. 49, Section 17(2), by any city within the County, the County shall receive 15 percent of the city tax; provided further, that if the rate provided in this chapter, as hereafter amended, is less than the rate imposed under RCW 82.14.030(2), by any city within the County, the County shall receive that amount of revenue from such city tax equal to 15 percent of the rate of tax imposed by the County under this chapter.