The rate of the additional tax imposed under ECMC 3.05.010, as authorized by RCW 82.14.030(2), shall be five-tenths of one percent of the selling price or value of the article used as the case may be; provided, however, that during such period as there is in effect a sales or use tax imposed by Grant County under RCW 82.14.030(2) at a rate equal to or greater than the rate imposed by this section, the county of Grant shall receive 15 percent of the tax imposed by this section; provided further, that during such period as there is in effect a sales or use tax imposed by Grant County under RCW 82.14.030(2) at a rate which is less than the rate imposed by this section, the county of Grant shall receive from the tax imposed by this section that amount of revenue equal to 15 percent of the rate of the tax imposed by the county of Grant under RCW 82.14.030(2). (Ord. 240 § 3, 1985; Ord. 117 § 7, 1970)