The high-low method is a technique used in cost accounting to separate variable and fixed costs by analyzing the highest and lowest levels of activity. By computing the difference between the high and low levels of maintenance costs, the clerk determines the variable portion of maintenance costs.

High-Low Method Calculation:

Identify the highest and lowest activity levels and their corresponding costs.

Compute the change in cost (difference between high and low costs).

Compute the change in activity level (difference between high and low activity).

Divide change in cost by change in activity to determine the variable cost per unit.

Variable Costs Identified: The cost that changes with activity level is the variable maintenance cost.

Option A (Fixed maintenance costs): Fixed costs remain unchanged regardless of activity level, but the high-low method focuses on variable costs.

Option C (Mixed maintenance costs): Mixed costs include both fixed and variable components, but the high-low method isolates the variable portion.

Option D (Indirect maintenance costs): Indirect costs refer to overhead expenses, which may or may not be relevant in the high-low method analysis.

IIA’s Business Knowledge for Internal Auditing (CIA Exam Part 3 Syllabus) covers cost accounting concepts, including cost behavior analysis and methods like the high-low approach.

IIA’s Guide on Financial Management & Internal Control supports understanding cost analysis techniques for budgeting and financial planning.

Why Option B is Correct:Why Other Options Are Incorrect:IIA References:Thus, the most appropriate answer is B. Variable maintenance costs.