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HIGH-LOW METHOD
Key Terms and Concepts to Know
Variable, Fixed and Mixed Costs Many costs are clearly variable, such as direct labor and direct materials, or clearly fixed, such as rent and salaries. Other costs, called mixed costs, have both variable and fixed cost components. The total cost of a cell phone contract which charges a fixed amount for a certain number of minutes per month and then an additional amount per minute for additional minutes used in the month is a mixed cost. Mixed costs must be separated into their variable and fixed elements so that their behavior can be predicted when the activity level changes.
Least Squares Regression Method A rigorous, mathematical approach in which a series of data points are used to develop a regression line to predict total costs.
Scattergraph Method Plots a series of data points for the mixed costs and the activity that produced these costs. The Y-axis is dollars of mixed cost and the X axis is the activity level. A regression line is drawn by best guess through one of the data points and a point on the Y-axis with an approximately the same number of data points above and below the line. The point where the line crosses Y axis represents the fixed cost, the only cost incurred at zero activity. For any data point, the difference between the total mixed cost and the fixed cost is total variable cost and total variable cost divided by the activity level for the data point is variable cost per unit.
High-Low Method From a series of data points, uses the data points with the highest and lowest activity level (X values) to develop a regression line to predict total costs. Not a statistically valid method as only two data points from the population of data points are used.
Key Topics to Know
Separating Mixed Costs into Fixed and Variable
Elements
Mixed costs must be separated into their fixed and variable elements and a regression line developed to predict total mixed costs at various levels of activity. The equation of the regression line takes the form:
Total Cost = Fixed Cost + Variable Cost Y = a + b(X)
High-Low Method
Variable cost per unit (b) is calculated first:
High Point - Low Point = Change Cost $ $ $ $ Activity activity activity activity
Change in Cost $ = Variable cost/unit Change in Activity
Using either the high point or low point, total fixed cost is calculated next:
Fixed Cost = Total Cost - Variable Cost a = Y - b(X)
Practice Problems
Practice Problem #
Active Company accumulated the following data for a delivery truck.
Miles Driven Total Cost Miles Driven Total Cost January 10,000 $15,000 March 9,000 $12, February 8,000 $14,500 April 7,500 $13,
Required: a) Determine the equation to predict total costs for the delivery truck. b) Calculate the total costs be if 12,187 miles were driven.
Practice Problem #
When the Tom-Tom Company’s controller was asked to budget the cost of manufacturing supplies for the next year, she plotted supplies cost and units produced by month for the year. She then drew a regression line through the point she plotted for November when the supplies cost was $21,000 and 5,000 drum sets were produced.
Required: If the regression line intersected the Y axis at $6,000, determine the equation of the regression line.
Practice Problem #
Data concerning Nelson Company's activity for the first six months of the year appear below:
Machine Hours Electrical Cost January 4,000 $3, February 6,000 4, March 4,800 3, April 5 ,800 5 , May 3,600 2, June 4,200 3,
Required: Using the high-low method of analysis, estimate the variable electrical cost per machine hour.
True / False Questions
- The equation for a mixed cost is total fixed costs + variable cost per unit units of activity = total cost. True False
- The high-low method uses cost and activity data from just two data points to establish the formula for a mixed cost. True False
- Mixed costs are included in cost of goods sold on the income statement. True False
- Analyzing mixed costs is only necessary when preparing a contribution income statement. True False
- The high-low method uses the highest and lowest data points based on cost. True False
- The high-low method uses the highest and lowest costs regardless of whether they are from the data points with the highest and lowest activity levels. True False
c) A cost that is $20,000 when production is 50,000, and $40,000 when production is 70,000. d) A cost that is $40,000 when production is 50,000, and $40,000 when production is 70,000.
6. Which of^ the following is a mixed cost?
a) A cost that is $20.00 per unit when production is 50,000, and $20.00 per unit when production is 80,000. b) A cost that is $20.00 per unit when production is 50,000, and $12.50 per unit when production is 80,000. c) A cost that is $20.00 per unit when production is 50,000, and $16.25 per unit when production is 80,000. d) A cost that is $40.00 per unit when production is 50,000, and $40.00 per unit when production is 80,000.
Solutions to Practice Problems
Practice Problem # a) High Point - Low Point = Change Cost $ $15,000 $13,000 $2, Activity 10,000 7,500 2,
Change in Cost $
= $0.80 variable cost/unit Change in Activity 2,
Using either the high point or low point, total fixed cost is calculated next: Fixed Cost = Total Cost - Variable Cost $7,000 = $15,000 - $8,000 = $0.80 (10,000) OR $7,000 = $13,000 - $6,000 = $0.80 (7,500)
The equation is: Y = $7,000 + $0.80(X) b) Total Cost = Fixed Cost + Variable Cost Y = a + b(X) $16,750 = $7,000 + $9,750 = $ 0 .80 (12,187)
Practice Problem # 2 :
Since the Y intercept is known, use the equation to solve for the variable cost per unit:
Y = a + b(X) $21,000 = $6,000 + 5000b b= $3.
The equation will be: Y = $6,000 + $3(X) where X is the number of units produced and Y is the total mixed cost.
Solutions to True / False Problems
- True
- True
- False – mixed costs may be part of cost of goods sold as well as selling and administrative costs.
- True
- False - the high-low method uses the highest and lowest data points based on activity.
- False – the high-low method uses the costs associated with the highest and lowest activity points, regardless of whether these costs are the highest or lowest costs for any data point.
Solutions to Multiple Choice Questions
1. C
2. D
3. B
4. C
5. B
6. C
