The rate of the tax imposed by Section 3.04.010 shall be a rate not to exceed one-half 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 the county, the rate of tax imposed by this chapter shall be a rate not to exceed four hundred twenty-five one thousandths of one percent. (Ord. 202 § 2, 1970).