My domestic helper has asked for a raise. May I ask what is an appropriate amount after working with me for 2 years? After the 1st year, we raised it by $20.

I think 5% is a good percentage taking into account inflation as well. $20 seems to be just about the same amount I would give as a raise pegged to her current salary. If she's getting paid $400/month then a 5% increment would mean $20. I don't suggest giving big increments as small increments tend to give the impression of progress. Just my thoughts!