In problem-solving with the decision-making framework, one should use the total cost approach since it is less tedious and less time consuming to compute, and is ako, more accurate with a final result. must only use the total cost approach since it is the most comprehensive approach. must only use the relevant cost or the differential approach since it isolates specifically what changes and what does not change. can use either the total cost approach or the relevant cost approach, since the end result will be the same using either method