Solving the problem by using Excel Solver with Simplex LP option: Machine-hours Required per Truck INPUT Department Engine assembly Metal stamping Model 101 assembly Model 102 assembly DECISION VARIABLE Number of Model 101 trucks Number of Model 102 trucks OBJECTIVE Total Machine-hours Model 101 1.0 2.0 Model 102 2.0 2.0 Availble per Month 4,000 6,000 2.0 5,000 3.0 4,500 Total contribution toward fixed costs CONSTRAINTS 2,000 1,000 Machine-hours Engine assembly 4,000