It depends on different variables involved, i.e. Experience, Sense of Responsibility, Number of children, Living arrangements, Area in which you live and the Benefits you give to nanny. Also it varies from country to country. The average Nanny Salary in United States is Live in (Average 45-50 hours) = $1600 - $2400 monthly Live out (Average 45-50 hours) = $2000 - $2800 monthly And if she is mother's helper = $8 - $13 per hour.
You should probably be getting the wages of $620-$820 monthly.
About 75 dollars every day they are watched
It should be around $1000 a month.