Use the following to answer question: 
-(Table: Production Possibilities for Machinery and Petroleum) Use Table: Production Possibilities for Machinery and Petroleum.The opportunity cost in the United States of producing 30 units of petroleum is _____ units of machinery.
Definitions:
Personal Preference
An individual's choice or liking, reflecting their tastes or desires.
Training Needs
The specific skills or knowledge gaps that need to be addressed for an individual or group to reach their goals efficiently.
Smooth Muscle
A type of involuntary, non-striated muscle found within the walls of organs and structures such as blood vessels, the digestive tract, and the uterus.
Respiratory Airways
The parts of the respiratory system through which air flows, starting from the nose and mouth down to the lungs.
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