A Business Process (BP):
 -a grouping of tasks needed to complete the process-

There are 2 types of tasks:

When it comes to tasks, there are two categories:
subjective tasks (ST) and non-subjective tasks (NST).

The former requires human time and/or input, whereas the latter doesn't necessitate any human involvement.  

T =​ Task Time.
$ =​ Dollars per Task Time.
A simple formula illustration is as follows:

BP - Task Count = (ST) + (NST)

BP - Time Total = (ST x T) + (NST x T)

BP - Cost Total = (ST x T x $) + (NST x T x $)

Because tasks may have different STs and NSTs may have different values of T x $.
(n) = The task variable set.