You don't say what type of job it is you're applying for. However, in my experience companies that expect you to tell them what remuneration you're looking for are looking to fill individually-contracted posts with people who have a fairly well-honed appreciation of their own value in the market place.
If the job is for a pilot's position, then you need to know what the average salary and benefits are for a pilot of your experience on their type of aircraft in their part of the world. A study of PPJN will give you a feel for the going rates, but may not tell you about things like health insurance, loss of licence insurance, critical illness cover, staff travel, schooling, housing and other things, all or any of which may tip the balance one way or the other. You have to decide what the minimum package you can accept would be, and pitch your aim somewhat higher than that. If you doubt they can accommodate you, are your aims too high, or are they trying to get someone on the cheap? Your call!
Scroggs