Nova Company's total overhead cost at various levels of activity are presented below: Total Overhead Cost Machine- Month April May June July Hours 45,000 196,950 35,000 172,050 55,00 221,850 65,000 246,750 Assume that the total overhead cost above consists of utilities, supervisory salaries, and maintenance. The breakdown of these costs at the 35,000 machine-hour level of activity is Utilities (variable) Supervisory salaries (fixed) Maintenance (mixed) Total overhead cost $ 49,000 68,000 55,050 $172,050