Answer:
Th answer is: I would reward the managers of restaurants 1 and 2
Explanation:
In my opinion Marcia should reward the two managers from restaurants 1 and 2 based upon the percentage of sales increase. She could give an X$ bonus to the manager of restaurant 1 as a prize for increasing sales by two percent. Then she could also give the manager of restaurant 2 the same X$ bonus but also give him (or her) a 3% raise.
I wouldn´t take any type of actions regarding the manager of restaurant 3. I would be let him know that I was rewarding the other managers because they performed better than him. I believe that rewards are usually more beneficial than punishments. I also believe people are selfish and greedy, so when manager 3 realizes he lost the opportunity of earning a bonus and a raise due to his poor performance, he will be motivated to work better next year.