Answer:
Explanation:
It's been a while since I've read, but here is what I remember:
Rainsford must have quite a bit of money to hunt big game and travel as he does.
It can also be inferred that he was a soldier in WW1 both by an allusion made in the text and by his skills whilst being hunted.
Though the text never directly states that Rainsford killed Zaroff, some of the closing lines were; "The general made one of his deepest bows. 'I see,' he said. "Splendid! One of us is to furnish a repast for the hounds. The other will sleep in this excellent bed. On guard, Rainsford....'", and as the story closes out, Rainsford comments that he "[h]e had never slept in a better bed."
