The rate of the tax imposed by PMC 3.25.010 shall be 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 Franklin County, the rate of tax imposed by this chapter shall be four hundred twenty-five one-thousandths of one percent. [Ord. 1413 § 2, 1970; Code 1970 § 3.96.020.]