Two models of a product - Regular (X) and Deluxe (Y) - are produced by a company. A linear programming model is used to determine the production schedule. The formulation is as follows:
Maximize profit = 50x +60y
Subject to 8x 10y ?_<800 (labor hours)
X + y _<120 (total units demanded)
4x +10y _<500 raw materials
X,y_>0
The optimal solution is X=100, Y=0.
Which of these constraints is redundant?
Select one:
a. the third constraint
b. None of these
c. the first constraint
d. the second constraint
e. All of these