Riker Co. is considering which of 4 different projects to undertake in order to maximize its net present value (NPV) . Define Xi as a binary variable that equals 1 if project i is undertaken and 0 otherwise, for i = 1, 2, 3, 4. The NPV and required capital (in millions) for each project are listed below. 
What is the proper objective function?
Definitions:
Vocational Interest Scales
Tools used for assessing individuals’ preferences and interests in various vocational areas to guide career decision-making.
Altruism
The selfless concern for the well-being of others, often leading to acts of kindness without expectation of reward.
Oregon
A state in the Pacific Northwest region of the United States, known for its diverse landscape of forests, mountains, farms, and beaches.
Vocational Interest Scales
Assessment tools designed to evaluate individuals' career interests, preferences, and inclinations to guide them towards suitable career paths.
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