The thing that was learned about the change in the job was that Troy was now able to drive the garbage truck.
It should be noted that the central idea conveyed in a particular passage or paragraph is simply what the author wants the readers to know.
From the story, Troy went to see his boss and the union and he informed them told him he'll like the union to change the description of the job so that everyone will have a chance to drive the truck.
This change was illustrated on page 44 as Troy was now able to drive the truck. He was responsible for the change due to the confrontation that he had with his boss.
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