Prince Companies total overhead at various levels of activity are presented below: Assume the overhead costs consist of utilities, supervisory salaries, depreciation and maintenance. The breakdown of these costs at an 80,000DLH for the month of October is shown below: Please complete the following: 1. Estimate how much of the 483,200 in overhead costs in December was maintenance costs. 2. Use the high-low method to determine the cost formula for maintenance. 3. Express the company's total overhead cost in a " Y=mx+b " format. 4. What total overhead cost would you anticipate at an activity level of 90,000 DLH