Howell Corporation produces an executive jet for which it currently manufactures a fuel valve; the cost of the valve is indicated below:

Cost per Unit Variable costs Direct material $960 Direct labor 640 Variable overhead 300 Total variable costs $1,900 Fixed costs Depreciation of equipment 500 Depreciation of building 180 Supervisory salaries 280 Total fixed costs 960 Total cost $2,860

The company has an offer from Duvall Valves to produce the part for $2,160 per unit and supply 1,020 valves (the number needed in the coming year). If the company accepts this offer and shuts down production of valves, production workers and supervisors will be reassigned to other areas. The equipment cannot be used elsewhere in the company, and it has no market value. However, the space occupied by the production of the valve can be used by another production group that is currently leasing space for $55,200 per year. Incremental cost of buying valves is $ .