Final answer:
ABC Ltd. employs a discretionary approach to determine bonus pool contributions, as evidenced by the variable percentage of pre-tax profits allocated each year.
Step-by-step explanation:
ABC Ltd. is using a discretionary formula to determine contributions into the bonus pool. This approach is due to the percentage of pre-tax profits allocated ranging significantly from year to year — between zero and 50 percent. Since there is no specific fixed percentage or fixed threshold, and the contribution varies, it's clear that the decision on how much to allocate is made at the discretion of the company, hence the term discretionary.