Estimate how much of the $259,060 of overhead cost in July was maintenance cost. (Hint: To do this, it may be helpful to first determine how much of the $259,060 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs.) Using the high-low method, estimate a cost formula for maintenance in the form Y = a + bX. Express the companys total overhead cost in the form Y = a + bX. What total overhead cost would you expect at an activity level of 44,000 machine-hours