Answer:
The goal is to maximize profit.
Profit will be represented by the letter Z in the model.
The restrictions are the labor-hours available in each department.
Department A hours ≤ 450
Department B hours ≤ 350
Department C hours ≤ 50
The decisions variables are:
X1 = Units to produce of Product 1
X2 = Units to produce of Product 2
X3 = Units to produce of Product 3
MODEL:
Maximize Z = $25X1 + $28X2 + $30X3
Subject to: X1 + X2 + X3 ≤ 450
X1 + X2 + X3 ≤ 350
X1 + X2 + X3 ≤ 50
X1, X2, X3 ≥ 0