Where, in any Act or subordinate instrument for the time being in force, a number (whether whole or fractional) of what in the Act or subordinate instrument are referred to as "penalty units" is prescribed as the penalty for an offence against that Act or subordinate instrument or is specified for some other purpose in that Act or subordinate instrument, then the Act or subordinate instrument shall, subject to section 37 of the Acts Interpretation Act 1931 , be construed as setting out a penalty of a number of dollars equal to the product obtained by multiplying the amount specified in the most recent notice published under section 4A(4) by the number of penalty units so prescribed or so specified.