Crosshill Company's total overhead costs at various levels of activity are presented below: Total Overhead Month April May June July Machine-Hours 70,000 60,000 80,000 90,000 Cost $199,200 $175,800 $222,600 $246,000 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 60,000-machine-hour level of activity in May is as follows: Utilities (variable) Supervisory salaries (fixed) Maintenance (mixed) Total overhead cost $ 49,200 21,000 105,600 $175,800 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $246,000 of overhead cost in July was maintenance cost. (Hint: To do this, first determine how much of the $246,000 consisted of utilities and supervisory salaries. Think about the behaviour of variable and fixed costs within the relevant range.) (Round the "Variable cost per unit" to 2 decimal places.) Maintenance cost in July 2. Using the high-low method, estimate a cost formula for maintenance. (Round the "Variable cost per unit" to 2 decimal places.) Machine- Hours Maintenance Cost High activity level Low activity level Change Variable cost element Fixed cost element Y = + 0 $ 0 per MH 3. Express the company's total overhead cost in the form Y = a + bx. (Round the "Variable cost per unit" to 2 decimal places.) Utilities cost Supervisory salaries cost Maintenance cost Variable Cost per Machine-Hour Fixed Cost Total overhead cost $ 0.00 $ 0 Y = 4. What total overhead cost would you expect to be incurred at an activity level of 75,000 machine-hours? (Round the "Variable cost per unit" to 2 decimal places.) Total overhead cost