108.2. The by-law made under the first paragraph of section 97.2 must prescribe the amount of the fine referred to in section 108.1, which amount must, in all cases, include the transportation dues and an additional amount that may vary according to those dues. For a first offence, the set or maximum additional amount may not exceed $5,000 in the case of a natural person and $10,000 in all other cases. The additional amounts are doubled for a subsequent offence. The minimum additional amount may not be less than $250.