Abigail's Auto Art Is a Company That Applies Pinstripes to Vehicles

Abigail's Auto Art is a company that applies pinstripes to vehicles. Abigail's cost for a basic 1-colour pinstriping job is $40, and she charges $100 for this service. For a total price of $180, Abigail will apply a fancier 3-colour pinstripe application to an automobile, a service that adds an additional $50 to the total cost of the package. What is Abigail's marginal benefit if she sells a basic 1-colour job?

A) $40
B) $50
C) $100
D) The marginal benefit cannot be determined.