Nova Company's total overhead cost at various levels of activity are presented below: Total Overhead Cost Month April May June July Machine-Hours 46,000 36,000 56,000 66,000 $ 181,760 $ 155,160 $208,360 $234,960 Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 36,000 machine-hour level of activity is: Utilities (variable) Supervisory salaries (fixed) Maintenance (mixed) Total overhead cost $57,600 44,000 53,560 $ 155,160 Nova Company's management wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $234,960 of overhead cost in July was maintenance cost. (Hint: to do this, it may be helpful to first determine how much of the $234,960 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs.) 2. Using the high-low method, estimate a cost formula for maintenance in the form Y = a + bx. 3. Express the company's total overhead cost in the form Y = a + bx. 4. What total overhead cost would you expect to be incurred at an activity level of 41,000 machine-hours? Complete this question by entering your answers in the tabs below. Required 1 Required 2 Required 3 Required 4 Estimate how much of the $234,960 of overhead cost in July was maintenance cost. (Hint: to do this, it may be helpful to first determine how much of the $234,960 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs.) (Do not round intermediate calculations.) Maintenance cost in July