15.1. Every person who is guilty of an offence contemplated in section 15 is liable, if no other penalty is provided for such offence, in addition to payment of the costs,(a) in the case of an individual, to a fine of not less than $250 nor more than $575;
(b) in the case of a corporation, to a fine of not less than $575 nor more than $1 150;
(c) for a first subsequent offence within two years, to a fine the amount of which must not be less nor greater than twice the fines provided for in paragraph a or b, as the case may be;
(d) for every other subsequent offence within two years, to a fine the amount of which must not be less nor greater than three times the fines provided for in paragraph a or b, as the case may be.