Answer:
Stage 1 kit Stage 2 kit Differential amount
Selling price $30 $36 $6
Materials cost ($16) ($16) $0
per unit
Additional labor $0 $18/2 = ($9) ($9)
cost per unit
Contribution margin $14 $11 ($3)
per unit
Anna will lose $3 for every Stage 2 kit that she sells. Only if he is able to sell a much higher quantity of Stage 2 kits would it be worth it, but under current conditions Anna should focus on selling Stage 1 kits.