Nova Company's total overhead cost at various levels of activity are presented below:

Month Machine- Hours Total Overhead Cost

April 52,500 $ 205,200
May 42,000 $ 180,000
June 63,000 $ 230,400
July 73,500 $ 255,600

Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 42,000 machine-hour level of activity is:

Utilities (variable) $ 54,600
Supervisory salaries (fixed) 64,000
Maintenance (mixed) 61,400
Total overhead cost $ 180,000

Nova Company's management wants to break down the maintenance cost into its variable and fixed cost elements.

Requirement 1: Estimate how much of the $255,600 of overhead cost in July was maintenance cost.

Maintenance cost $
Requirement 2: Using the high-low method, estimate a cost formula for maintenance.
Y = $ + $ X
Requirement 3: Express the company's total overhead cost in the linear equation form Y = a +bX.
Y = $ + $ X
Requirement 4: What total overhead cost would you expect to be incurred at an operating activity level of 46,200 machine-hours?
Total overhead costs $