Rank products by contribution per labor hour under labor constraint

Steps:

• Identify limiting factor: labor shortage requires maximizing contribution per labor hour.
• Note Z has no labor hours listed, so it uses zero labor and ranks first (unlimited production possible without consuming resource).
• For X and Y, compute contribution per labor hour: X = 150 / 1.25 = 120; Y = 175 / 0.75 ≈ 233.
• Rank: Z (infinite per hour), then Y (233), then X (120).

Why C is correct:

• C (Z Y X) follows limiting factor rule: prioritize non-users of scarce resource first, then highest contribution per unit of resource.

Why the others are wrong:

• A: Starts with X, which has lowest contribution per labor hour.
• B: Starts with Y, ignoring Z's zero labor use.
• D: Places X before Y, reversing their contribution per labor hour order.

Final answer: C