Crosshill Company's total overhead costs at various levels of activity are presented below: Month April May June July Machine Hours 73,000 63,000 83,000 91,000 Total Overhead Cout $122,000 $136.000 $379,000 $177,000 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 63,000-machine-hour level of activity in May is as follows: Utilities (variable) Supervisory salaries (fixed) Maintenance (mixed) Total overhead coat $ 29,000 23,000 86,000 $136,000 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $177,000 of overhead cost in July was maintenance cost. (Hint: To do this, first determine how much of the $177,000 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 0 $ 0 Variable cost element Fixed cost element per MH per MH Variable cost element Fixed cost element YE 3. Express the company's total overhead cost in the form Y = a + bx. (Round the "Variable cost per unit" to 2 decimal places.) Variable Cost per Machine-Hour Fixed Cost Utilities cost Supervisory salaries cout Maintenance cost Total overhead cost $ 0.00 $ 0 Y 4. What total overhead cost would you expect to be incurred at an activity level of 78,000 machine-hours? (Round the "Variable cost per unit" to 2 decimal places.) Total overhead cost