The Wildcat Company has provided the following information:

Units of Output 30,000 units 42,000 units

Direct Materaisl $180,000 $252,000

Workers' wages 1,080,000 1,512,000

Supervisors' salaries 312,000 312,000

Equipment depreciation 151,200 515,200

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.