Grush Consulting has five projects to consider. Each will require time in the next two quarters according to the table below. 
Revenue from each project is also shown. Develop a model whose solution would maximize revenue, meet the time budget of 25 in the first quarter and 20 in the second quarter, and not do both projects C and D.
Definitions:
Contiguity
In psychology, contiguity refers to the closeness or proximity in time or space between two events or stimuli, often associated with classical conditioning.
Classical Conditioning
The phenomenon where a response, initially elicited by a second stimulus, is later elicited by the first stimulus alone, due to the repeated association of the two stimuli.
Fear
An emotional response to perceived threats, leading to avoidance or defensive behavior.
Classical Conditioning
A learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus.
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