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Nova Companys total overhead cost at various levels of activity are presented below:

Month	Machine- Hours			Total Overhead Cost
April		46,000		$	189,920
May		36,000		$	166,220
June		56,000		$	213,620
July		66,000		$	237,320

Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 36,000 machine-hour level of activity is:

Utilities (variable)	$	43,200
Supervisory salaries (fixed)		68,000
Maintenance (mixed)		55,020
Total overhead cost	$	166,220

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

Required:

1. Estimate how much of the $237,320 of overhead cost in July was maintenance cost. (Hint: to do this, it may be helpful to first determine how much of the $237,320 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed costs.) I got the answer of $90,120 correct

2. Using the high-low method, estimate a cost formula for maintenance in the form Y = a + bX.

3. Express the companys total overhead cost in the form Y = a + bX.

Variable Cost per Machine Hour Fixed Cost

Utility Cost

Supervisory Salaries Cost

Maintenance Cost

Total Overhead Cost Y=____+______X

4. What total overhead cost would you expect to be incurred at an activity level of 41,000 machine-hours?

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