68. The Commission determines an employer’s first-level personalized rate according to risk by applying the following formula:
first-level personalized first-level risk index X first-level
rate according to risk = unit rate according to risk
The first-level unit rate according to risk corresponds to the portion of the unit rate applicable to the employer for the assessment year that the Commission associates with first-level risk when the rate is fixed pursuant to section 304 of the Act.