"I'll work on my report here, okay? I'll stay with you until you feel safe to wake up. I will stay."
So he started working on his report and number projection. He wasn't good at this. He didn't have a degree nor did he have prior job experience.
What he understood came from the books he read during his serving time. He didn't even know why there was an accounting book in prison, but he read it and tried to work on the problem sets because he heard from a fellow inmate that he used to work as an accountant. An executive in the company blackmailed this accountant into helping him embezzle the money; the rest was history.
Fast forward almost a decade later, Mark didn't find the terms strange. He only needed a few examples from his boss on how to produce the report, what layout he liked to read, and so forth, so in the end, he only needed minor feedback to produce the final one. Since then, he could work alone and his reports were never far off the standard.