Nova Company's total overhead cost at various levels of activity are presented below: Assume the total overhead cost above consisis of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 43.000 machine-hour level of activity is: Nova Company's manogement wants to break down the maintenance cost into its variable and fixed cost elements. 1. Estimate how much of the $257,930 of overhead cost in July was maintenance cost. (Hint: To do this, it may be helpful to first determine how much of the $257,930 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixe 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 at an activity level of 48,000 machine-hours? Complete this question by entering your answers in the tabs below. Estimate how much of the $257,930 of overhead cost in July was maintenance cost. (Hint: to do this, it may be helpful to first determine how much of the $257,930 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs.) Note: Do not round your intermediate calculations