Where in Santo Domingo?
From talking with some of the middle class Dominicans that I know.. the rate for day workers in the house is more like 700 pesos a day (yes, well, this is Gazcue!)
Even though they may get the work done in 4 hours, they are not likely to have another job on the days that they are working for you.
Transport costs run around 100 pesos a day depending on how far you are from where they are living.
And there are divisions of labor.. in that you may find someone who is a good heavy cleaner, someone who can do laundry, someone who can cook, someone who will take the initiative..
Can you speak a bit more of what the job is?
I can ask around.
English is going to be hard to find...
Let us know where you live though..