
Answer: Â Â Â Â Â Â Â
                  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.