Answer:
$9.75
Explanation:
the contribution margin of product J = $23.70 - $15.65 = $8.05
the contribution margin of product D = $43.65 - ($9.75 + $15.65) = $18.25
the differential cost of producing product D is equal to the additional cost incurred by further processing product J = $9.75
differential costs or expenses are the difference in costs resulting from choosing one activity over another, or like in this case, further processing one product into another.