Nova Companys total overhead cost at various levels of activity are presented below: Month Machine-Hours Total Overhead Cost April 50,000 $201,200 May 40,000 $176,800 June 60,000 $225,600 July 70,000 $250,000 Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 40,000 machine-hour level of activity is: Utilities (variable) $ 52,000 Supervisory salaries (fixed) 63,000 Maintenance (mixed) 61,800 Total overhead cost $ 176,800 Nova Companys management 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, it may be helpful to first determine how much of the $250,000 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs!) (Do not round intermediate calculations.) 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.) 3. Express the companys total overhead cost in the linear equation form Y = a + bX. (Do not round your intermediate calculations. Round the "Variable cost per unit" to 2 decimal places.) 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.)