How do I find the decimal part of sales if my figures are 4500.00,3000.00,1200.00, and 2300.00 worth of sales out of 11,000.00.

Well, I don't quite understand what you mean by decimal part here... or perhaps you really mean the 'fractional part', which some people call as 'decimal part'. Well, if that's so, then, the decimal part is the numbers after the decimal point, that is the zeros you have.