E21-30 Determing mixed costs—the high-low method

The manager of Able Car Inspection reviewed the monthly operating costs for the past

year. The costs ranged from $4,000 for 1,000 inspections to $3,600 for 600 inspections.

Requirements

3. 3,800

1. Calculate the variable cost per inspection.

2. Calculate the total fixed costs.

3. Write the equation and calculate the operating costs for 800 inspections.

4. Draw a graph illustrating the total cost under this plan. Label the axes, and

show the costs at 600, 800, and 1,000 inspections.

E21-31 Calculating contribution margin ratio, preparing contribution margin

income statements

For its top managers, Worldwide Travel formats its income statement as follows:

Learning Objective 2

2. $245,000 sales level, VC $73,500

Variable Costs $95,250

Sales Revenue $317,500

Fixed Costs $175,000

Contribution Margin $222,250

Operating Income $47,250

WORLDWIDE TRAVEL

Contribution Margin Income Statement

Three Months Ended March 31, 2014

Worldwide’s relevant range is between sales of $245,000 and $364,000.

Requirements

1. Calculate the contribution margin ratio.

2. Prepare two contribution margin income statements: one at the $245,000 sales

level and one at the $364,000 sales level. (Hint: The proportion of each sales

dollar that goes toward variable costs is constant within the relevant range.)

E21-37 Using sensitivity analysis

Dependable Drivers Driving School charges $250 per student to prepare and administer

written and driving tests. Variable costs of $100 per student include trainers’

wages, study materials, and gasoline. Annual fixed costs of $75,000 include the

training facility and fleet of cars.

Requirements

1b.625 Students

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 $220 per student.

c. Decrease variable costs to $50 per student.

d. Decrease fixed costs to $60,000.

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.

P21-63 Computing breakeven sales and sales needed to earn a target profit;

performing sensitivity analysis

This problem continues the Davis Consulting, Inc. situation from Problem P19-40

of Chapter 19. Davis Consulting provides consulting service at an average price of

$175 per hour and incurs variable cost of $100 per hour. Assume average fixed costs

are $5,250 a month.

Requirements

1. What is the number of hours that must be billed to reach the breakeven point?

2. If Davis desires to make a profit of $3,000, how many consulting hours must be

completed?

3. Davis thinks it can reduce fixed cost to $3,990 per month, but variable cost will

increase to $105 per hour. What is the new breakeven point in hours?