RLB Electrical Contracting, Inc., bids on the same three jobs as Blank Plumbing (Section). RLB must supply wiring, conduits, electrical wall fixtures, and lighting fixtures. The following are needed supplies and their costs per unit:

ITEM COST/UNIT ($)
Wiring .........1.00
Conduits ........2.00
Wall fixtures ........3.00
Lighting fixtures .....5.00
Use matrix multiplication to compute the cost of materials at each jobsite.

DEMAND WIRING WALL LIGHTING Dormitory 50 Office Apartments20 PROJECT ROLLS) CONDUITS FIXTURES FIXTURES 100 30 50 20 30 10 10 70 30