69. The Commission determines an employer’s second-level personalized rate according to risk by applying the following formula:
second-level personalized second-level risk index X second-level
rate according to risk = unit rate according to risk
The second-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 the second-level risk at the time of the fixing of the rate under section 304 of the Act.