Constrained Optimization: Multiple Internal Constraints

Fisher Company produces two types of components for airplanes: A and B, with unit contribution margins of $400 and $600, respectively. The components pass through three sequential processes: cutting, welding, and assembly. Data pertaining to these processes and market demand are given below (weekly data).

Resource	Resource Available	Resource Usage (A)	Resource Usage (B)
Cutting	300 machine hours	Six hours	Ten hours
Welding	308 welding hours	Ten hours	Six hours
Assembly	400 labor hours	Four hours	Ten hours
Market demand (A)	50	One unit	Zero units
Market demand (B)	40	Zero units	One unit

Required:

What is the incremental benefit per machine hour caused by the additional ten hours, if any?

$ per machine hour