A search of the forum will turn up heaps of info regarding thought about salary requirements here. (use the search field just below the "profile" link at the upper right side of the page. As a single person, yes, it can be done but it's not ideal. However, if they are going to provide you either accommodation or a housing allowance, then it's easily doable in my opinion. Of course your lifestyle will govern your costs as well. If you are a drinker and heavy party person, you might come up a little thin but if you have to opt for your own housing, the best way, early on, would be to flat share (renting a room) in a condo
or to save even more money, an HDB flat. (that would set you back only around 6 to 800/mo for a Master bedroom. maybe 1~1.5 for a condo room. As noted, a search here will turn up a wealth of info.
It wouldn't hurt to try for more but how much more, I couldn't say. Maybe x9200 would have some ideas in that regard.