It’s been two and a half years since I work for a company as an Administrative Assistant. Our company does very well despite the economical situation in the country. Lately my work load doubled since we took over another company, so are my responsibilities. I’m paid currently $14/hour. Can somebody tell me how much raise should I ask? Thank you.

Is anyone else getting raises? Do employee's get regular raises there? For my work, I would never expect more than a dollar max. at a time because we get reviews twice a year and our scores determine the raise we get (or don't get).

Many companies, are using the currently unemployment to not only not give raises, but many are cutting employees pay.
I know our firm has not given out raises in several years.
But I would not go for more than 10 or 15 percent, on the other foot, how will it effect you if they say no.

If I get regular raises, they are usually .50 - 1.00 at a time. But I've worked for companies that didn't give them but every 2-4 or so years. Like one of my current jobs I suddenly got a $3 raise (pretty nice) but hadn't gotten one in the, uh... 4 years? I'd been working there. (The other of my current jobs has across-the-board percent raises decided towards the end of the fiscal year and not negotiable. This year's was 6% and that was a big one.)

The pay rate itself doesn't have a lot of meaning cause it's so different in different areas. (You sound like you're in an area like mine where pay isn't all that high.) Are you getting paid by the hour so that this work load is getting you more income? If not, I'd be seriously dealing with that issue. Not counting the workload I'd say $2 max, but if you're not getting more hours of pay due to increase workload, I'd want some other solution.

This is assuming they aren't going to get ticked and find an excuse to lay you off just for asking. Otherwise, nothing wrong with negotiating it down to something you can both agree on.