If hourly wage is $10 an hour, don't you think HOW MANY hours per day or per week the person works. If we assume 8 hours per day then we have:
8 X 10 X 30=$2,400 Monthly salary. But have assumed lots of things, inculding 8 hours per day and she/he is paid for every day including weekends. You have to be much more specific to get the right answer.