Response to the following problem:
The Wildcat Company has provided the following information:
Units of Output 30,000 Units 42,000 Units
Direct materials $180,000 $252,000
Workers' wages 1,080,000 1,512,000
Supervisors' salaries 312,000 312,000
Equipment depreciation 151,200 151,200
Maintenance 81,600 110,400
Utilities 384,000 528,000
Total $2,188,800 $2,865,600
Using the high-low method and the information provided above, identify the linear cost function equation.