I am just getting myself to code in Haskell and would like to design advice.  Below, I have a made up example:
                                                                                                                                                                                                                                                           
                                                                                                                                                                                                                                                                                 
data ClassRoom = ClassRoom { classRoomNo:: Integer, extra_fees::Float, students: Map StudentId Student}
data Student = Student {name::String, feesOwed::Float}
data StudentId = Integer                                                                                                                                                                                                                                                         
                                                                                                                                                                                                                                                                                 
get_fees_owed classroom student_id = extra_fees + feesOwed $ (students classroom) M.! studentid                                                                                                                                                                       

Here the `get_fees_owed`  needs information from the container 'classroom'. 

Here is my question/problem:
                                                                                                  

I believe I should model most of my code as expressions, rather than storing pre-computed values such as `fees_owed`.  But,
defining expressions involve passing the container objects all over. For example, deep down in a function that deals with just

one `student`, I might need the fees owed information. Without, having a reference to the container, I cannot call get_fees_owed.

Also, I think it hinders composing of functions that just deal with one student at a time, but end up with some dependency on

the container.