No problem at all, it is quite confusing....
Normally it will depend on where they live, some prefer to charge more for less children or some more children and charge less, modern child-minders with training and experience are childcare professionals and take in to consideration, the general cost of living where they are for example their rent/mortgage, wear and tear of their home, gas and electric charges for being at home all week with children and some offer organic home cooked meals etc. I am learning all about this on my course and from reading child-minding websites.
A great place for you to look for care would be
www.********* where you can find someone really close to you and save yourself a lot of time travelling.
Best of luck