[CMA Adapted] Troy Instruments uses ten units of Part Number S1798 each month in the production of scientific equipment. The unit cost to manufacturing one unit of S1798 is presented below.

Direct materials $ 4,000

Materials handling (10% of direct materials cost) 400

Direct manufacturing labor 6,000

Indirect manufacturing (200% of direct labor) 12,000

Total manufacturing cost $22,400

Materials handling represents the direct variable costs of the Receiving Department that are applied to direct materials and purchased components on the basis of their cost. This is a separate charge in addition to indirect manufacturing cost. Troys annual indirect manufacturing cost budget is one-fourth variable and three-fourths fixed. Duncan Supply, one of Troys reliable vendors, has offered to supply Part Number S1798 at a unit price of $18,000.

If Troy purchases the S1798 units from Duncan, the capacity Troy used to manufacture these parts would be idle. Should Troy decide to purchase the parts from Duncan, the unit cost of S1798 would _______ by $_______.

A.

decrease by $3,700.

B.

increase by $6,400.

C.

increase by $5,300.

D.

decrease by $5,600.