i need help witht he following managerial accounting question.

The Handley 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 Direct labor Variable overhead Total variable costs Fixed costs Depreciation of equipment Depreciation of building Supervisory salaries Total fixed costs Total cost $951 636 310 $1,897 500 197 296 993 $2,890 The company has an offer from Duvall Valves to produce the part for $2,175 per unit and supply 920 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 where, unfortunately, they really are not needed. 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 Should the company make or buy the valve? Total incremental of buying valves is The company should the valves