Nova Company’s total overhead cost at various levels of activity are presented below:
Month | Machine- Hours |
Total Overhead Cost |
|||
April | 48,000 | $ | 217,820 | ||
May | 38,000 | $ | 190,420 | ||
June | 58,000 | $ | 245,220 | ||
July | 68,000 | $ | 272,620 | ||
Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 38,000 machine-hour level of activity is:
Utilities (variable) | $ | 57,000 |
Supervisory salaries (fixed) | 70,000 | |
Maintenance (mixed) | 63,420 | |
Total overhead cost | $ | 190,420 |
Nova Company’s management wants to break down the maintenance cost into its variable and fixed cost elements.
Required:
1. Estimate how much of the $272,620 of overhead cost in July was maintenance cost. (Hint: to do this, it may be helpful to first determine how much of the $272,620 consisted of utilities and supervisory salaries. Think about the behavior of variable and fixed 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 to be incurred at an activity level of 43,000 machine-hours?
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