67.734.  Rate of tax. — The sales tax authorized under sections 67.730 to 67.739 may be imposed at a rate of one-fourth of one percent, three-eighths of one percent, one-half of one percent, or one percent, on the receipts from the sale at retail of all tangible personal property or taxable services at retail within the county adopting such tax, if such property and services are subject to taxation by the state of Missouri under the provisions of sections 144.010 to 144.525.