Crosshill Company's total overhead costs at various levels of activity are presented below: Month April May June July Machine- Hours 50,000 40,000 60,000 70,000 Total Overhead Cost $202,200 $178,300 $226, 100 $250,000 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 40,000-machine-hour level of activity in May is as follows: $ Utilities (variable) Supervisory salaries (fixed) Maintenance (mixed) 48,000 63,000 67,300 Total overhead cost $ 178,300 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $250,000 of overhead cost in July was maintenance cost. (Hint: To do this, first determine how much of the $250,000 consisted of utilities and supervisory salaries. Think about the behaviour of variable and fixed costs within the relevant range.) (Do not round intermediate calculations.) Maintenance cost in July 2. Using the high-low method, estimate a cost formula for maintenance. (Do not round your intermediate calculations. Round the "Variable cost per unit" to 2 decimal places.) Machine- Hours Maintenance Cost High activity level Low activity level Change per MH Variable cost element Fixed cost element 2. Using the high-low method, estimate a cost formula for maintenance. (Do not round your intermediate calculations. Round the "Variable cost per unit" to 2 decimal places.) Machine- Hours Maintenance Cost High activity level Low activity level Change per MH Variable cost element Fixed cost element Y = 3. Express the company's total overhead cost in the form Y = a + bx. (Do not round your intermediate calculations. Round the "Variable cost per unit" to 2 decimal places.) Variable Cost per Machine-Hour Fixed Cost Utilities cost Supervisory salaries cost Maintenance cost Total overhead cost Y= 4. What total overhead cost would you expect to be incurred at an activity level of 45,000 machine-hours? (Do not round intermediate calculations.) Total overhead cost