Nova company's total over head cost at various level of activity are presented below: month machine hr total overhead cost april........51,000.................199,810 may........41,000..................175,710 June........61,000.................223,910 July.........71,000................248,010 Assume that the total overhead cost above consist of utilities, supervisory salaries and maintenance. The breakdown of these costs at the 41,000 machine hour level of activity is: Utilities (variable)..........................................49,200 supervisory salaries (fixed)................................63,000 maintenance (mixed)......................................63,510 175,710 Nova managements want to break down the maintenance cost into variable and fixed cost elements. required: 1. Estimate how much of the $248,010 of overhead cost in July was maintenance cost. 2. using the high-low method, estimate a cost formula for maintenance. 3. express the company's total overhead cost in the linear equation form Y=a+bX 4. what total overhead cost would you expect to be incurred at an operating activity level of 46,000 machine hour?