Crosshill Company's total overhead costs at various levels of activity are presented below: Month Machine-Hours Total Overhead Cost April 53,000 $175,260 May 43,000 $153,060 June 63,000 $197,460 July 73,000 $219,660 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 43,000-machine-hour level of activity in May is as follows: Utilities (true variable) Supervisory salaries (true fixed) Maintenance (mixed) 47,300 42,000 63,760 Total overhead cost $ 153,060 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Determine how much of the total overhead cost in July was utilities cost, supervisory salaries costs, and maintenance cost, respectively. Briefly explain your calculations. (4 marks) 2. Using the high-low method, determine the cost formula specifically and only for maintenance cost. (3.5 marks) 3. Determine the company's total overhead cost in cost formula form. (2 marks) 4. Using the cost formula for total overhead cost, determine the expected total overhead cost that would be incurred at an activity level of 55,000 machine-hours? (1.5 marks)