Subtlility is definitely unappropriate here....
If the people you 're about to work for have a decent point of view about your duties I think you could expect more or less : 4000~5000 US$ per month and sincerely hoping you'll get more ! ( I was getting that much on a Falcon 50 six years ago in europe...)
Now the global situation being what it is, they might pay you far less than that depending where you work also ( they could ask you to clean the toilets for the same salary too nowadays).
Unfortunatly for us with all those guys selling themselves for peanuts now..means less and less money in our wallets.!
Try to get as much infos from the pilots already on this operation, phonecall to the chief pilot for example..
All the best for the interview !