The counties are hereby classified in accordance with § 8-24-101, and the compensation fixed by the county legislative body for attending sessions of the body shall in no case be less than the applicable amount as follows:  Counties of the third class  $35/day 
  Counties of the fourth class  $30/day 
  Counties of the fifth class  $25/day 
  Counties of the sixth class  $20/day 
  Counties of the seventh class  $20/day 
  Counties of the eighth class  $20/day