Weafer Incorporated reported the following results from last year's operations: 
Last year's return on investment (ROI) was closest to:
Definitions:
Psychophysics
The branch of psychology that studies the relationships between physical stimuli and the sensations and perceptions they produce.
Psychological Sensation
The initial process of detecting and interpreting environmental stimuli through the senses.
Perception
The process of organizing, identifying, and interpreting sensory information to represent and understand the environment around us.
Selection Factor
A source of bias that may occur in research findings when participants are allowed to choose for themselves a certain treatment in a scientific study.
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