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Chapter 20: Q3RQ (page 1119)
What is a mixed cost? Give an example.
Mixed cost is also known as semi-variable it includes both cost like variable and fixed cost.
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Question: Gilbert’s Steel Parts produces parts for the automobile industry. Thecompany has monthly fixed costs of \(640,220 and a contribution margin of85% of revenues.
Requirements
1. Compute Gilbert’s monthly breakeven sales in dollars. Use the contributionmargin ratio approach.
2. Use contribution margin income statements to compute Gilbert’s monthlyoperating income or operating loss if revenues are \)500,000 and if they are$1,050,000.
3. Do the results in Requirement 2 make sense given the breakeven sales youcomputed in Requirement 1? Explain.
The contribution margin income statement of Sugar Lips Donuts for August 2018 follows:
Sugar Lips sells three dozen plain donuts for every dozen custard-filled donuts. A dozen plain donuts sells for \(4.00, with total variable cost of \)1.80 per dozen. A dozen custard-filled donuts sells for \(8.00, with total variable cost of \)3.60 per dozen.
Requirements
1. Calculate the weighted-average contribution margin.
2. Determine Sugar Lips’s monthly breakeven point in dozens of plain donuts and custard-filled donuts. Prove your answer by preparing a summary contribution margin income statement at the breakeven level of sales. Show only two categories of costs: variable and fixed.
3. Compute Sugar Lips’s margin of safety in dollars for August 2018.
4. Compute the degree of operating leverage for Sugar Lips Donuts. Estimate the new operating income if total sales increase by 30%. (Round the degree of operating leverage to four decimal places and the final answer to the nearest dollar. Assume the sales mix remains unchanged.)
5. Prove your answer to Requirement 4 by preparing a contribution margin income statement with a 30% increase in total sales. (The sales mix remains unchanged.)
S20-9 Computing contribution margin, units and required sales to break even, units to achieve target profit
Compute the missing amounts for the following table:
Mi Tierra Driving School charges \(680 per student to prepare and administer written and driving tests. Variable costs of \)408 per student include trainers’ wages, study materials, and gasoline. Annual fixed costs of \(63,920 include the training facility and fleet of cars.
Requirements
1. For each of the following independent situations, calculate the contribution margin per unit and the breakeven point in units by first referring to the original data provided:
a. Breakeven point with no change in information.
b. Decrease sales price to \)544 per student.
c. Decrease variable costs to \(340 per student.
d. Decrease fixed costs to \)53,040.
2. Compare the impact of changes in the sales price, variable costs, and fixed costs on the contribution margin per unit and the breakeven point in units.
Determining mixed costs—the high-low method
The manager of Trusty Car Inspection reviewed the monthly operating costs for the past year. The costs ranged from \(4,300 for 1,300 inspections to \)3,900 for 900 inspections.
Requirements
1. Use the high-low method to calculate the variable cost per inspection.
2. Calculate the total fixed costs.
3. Write the equation and calculate the operating costs for 1,000 inspections.
4. Draw a graph illustrating the total cost under this plan. Label the axes, and show the costs at 900, 1,000, and 1,300 inspections.
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