The following graph is the production possibilities curve of a nation: 
Refer to the above graph. The total opportunity cost of nine drill presses is:
Definitions:
Problem Abatement
The act of reducing the severity, seriousness, or painfulness of a problem.
Generating Alternatives
The process of developing multiple options or solutions to address a problem or seize an opportunity.
Subjective Probability
An individual's personal judgment or belief about how likely an event is to occur, based on their own knowledge and experience.
Objective Probability
The likelihood of an event occurring based on factual and measurable data, independent of personal belief or bias.
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