Answer:
Omar is paid on a FIXED RATIO schedule whereas Vincenzo is paid on a VARIABLE RATIO schedule.
Step-by-step explanation:
When someone gets paid on a fixed ratio schedule, they are getting paid for every determined amount of time worked or tasks performed, e.g. you get paid $23 per hour, regardless of how much work you do.
Generally salespeople are paid using a variable ratio schedule because most (or all) of their salary is based on sales commissions. That means that the more they sell, the more money they earn, e.g. a salesperson is paid 3% of total sales.