1.) Describe how total variable costs and unit variable costs behave with changes in the level of activity. 2.) Which of the following costs would be classified as variable and which would be classified as fixed, if units produced is the activity base? Direct materials costs Electricity costs of $0.35 per kilowatt-hour 3.) If fixed costs increase, what would be the impact on the (a) contribution margin? (b) operating income? 4.) Both Austin Company and Hill Company had the same unit sales, total costs, and operating income for the current fiscal year; yet, Austin Company had a lower break-even point than Hill Company. Explain the reason for this difference in break-even points. 5.) How does the sales mix affect the computation of the break-even point