20. Every person who contravenes section 21 is guilty of an offence and liable(1) in the case of a natural person, for a first offence, to a fine of not less than $500 nor more than $1,500 and, for any subsequent offence, to a fine of not less than $1,500 nor more than $4,500;
(2) in the case of a legal person, for a first offence, to a fine of not less than $1,500 nor more than $4,500 and, for any subsequent offence, to a fine of not less than $4,500 nor more than $12,000.