Crosshill Company's total overhead costs at various levels of activity are presented below: Month April May June July Machine-Hours 66,000 56,000 76,000 86,000 Total Overhead Cost $135,000 $135,000 $318,000 $184,000 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 56,000-machine-hour level of activity in May is as follows: Utilities (variable) Supervisory salaries (fixed) Maintenance (Mixed) Total overhead cost $ 31,000 26,000 78,000 $135,000 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $184,000 of overhead cost in July was maintenance cost. (Hint: To do this, first determine how much of the $184,000 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 per MH Variable cost element Fixed cost element Y= + X 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 cost Maintenance cost Total overhead cost $ 0.00 $ 0 = 4. What total overhead cost would you expect to be incurred at an activity level of 71,000 machine-hours? (Round the "Variable cost per unit" to 2 decimal places.) Total overhead cost