33.12. The wage rates for the holder of an apprentice competency certificate as an ironworker, issued according to the provisions of section 28.19 of the Regulation respecting the issuance of competency certificates (chapter R-20, r. 5), in relation to the wage rates for a journeyman, are the percentages prescribed for a trade with 2 periods of apprenticeship, as set out in section 25, with a percentage of 85% for the third period.