Crosshill Companys total overhead costs at various levels of activity are presented below: Month Machine-Hours Total Overhead Cost April 70,000 $ 202,200 May 60,000 $ 180,300 June 80,000 $ 224,100 July 90,000 $ 246,000 Assume that the overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 60,000-machine-hour level of activity in May is as follows: Utilities (variable) $ 52,200 Supervisory salaries (fixed) 21,000 Maintenance (mixed) 107,100 Total overhead cost $ 180,300 The company wants to break down the maintenance cost into its variable and fixed cost elements. Required: 1. Estimate how much of the $246,000 of overhead cost in July was maintenance cost. (Hint: To do this, first determine how much of the $246,000 consisted of utilities and supervisory salaries. Think about the behaviour of variable and fixed costs within the relevant range.) (Round the "Variable cost per unit" to 2 decimal places.) 2. Using the highlow method, estimate a cost formula for maintenance. (Round the "Variable cost per unit" to 2 decimal places.)