The following registration fees for the classes indicated shall be paid to the division for the registration of vehicles subject to registration under this chapter when equipped with pneumatic tires:
(a) Registration fees for the following classes shall be paid to the division annually:
(1) Class A. — The registration fee for motor vehicles of this class is $50. The Division of Motor Vehicles may adjust this fee every five years on September 1, based on the U. S. Department of Labor, Bureau of Labor Statistics most current Consumer Price Index: Provided, That an increase in such fee may not exceed ten percent of the total fee amount in a single year: Provided, however, That the registration fees and any other fees required by this chapter for Class A vehicles under the optional biennial staggered registration system shall be multiplied by two and paid biennially to the division.