Exercise 5C: Usefulness of a restricted resource (Value: 10 points) The School Pack company manufactures school bags with a very resistant plastic bottom. It has three models that are the best sellers. The following table provides you with information about these models. Mod B $155 $60 Mod C $90.50 $27.50 Mod A Sale Price per Unit $115 Variable cost per unit $30 Processing time in the plastic machine for each unit 3 mins Amount of plastic per unit 4 lbs The restricted resource is the processing time on the machine. 4 mins 5 lbs 1 min 3 lbs 1. Determine the highest and lowest performance model in using processing time as a constrained resource. 2. Determine the model with the highest and the lowest performance in the use of plastic if this is the restricted resource. 3. Determine the model with the highest contribution margin. Did this model turn out to be the top performer in the answers above? If not, explain why