Outdoor Luggage Inc. makes high$-$end, hard$-$sided luggage for sports equipment. Data concerning three of the company$$s most popular models appear below.

Ski

Guard Golf

Guard Fishing

Guard

Selling price per unit $ $260$ $ $370$ $ $205$

Variable cost per unit $ $130$ $ $130$ $ $145$

Plastic injection moulding machine

processing time required per unit $4$ min $6$ min $9$ min

Kgs of plastic pellets per unit $9$ kg $16$ kg $7$ kg

Required:

$1-$a$.$ The total time available on the plastic injection moulding machine is the constraint in the production process. What is the contribution margin per unit of the constrained resources for Ski Guard, Golf Guard and Fishing Guard?