A supervisor for unorganized towns and gores shall receive $15.00 a day for time actually spent in the performance of his or her duties, except for his or her services as collector of taxes. On all taxes collected after the expiration of 90 days from mailing of his or her tax notice, such supervisor shall be allowed to tax and collect from the taxpayer a commission of eight percent in the amount of the tax, which commission shall be paid into the State Treasury as provided in section 4967 of this title. (Amended 1963, No. 193, § 31, eff. June 28, 1963.)