The rate of the tax imposed by GHMC 3.20.010 shall be one-half of one percent of the selling price or value of the article used; provided, however, that during such period as there is in effect a sales or use tax imposed by Pierce County, the rate of tax imposed by this chapter shall be four hundred twenty-five/one-thousandths of one percent. (Ord. 131 § 2, 1970).