In Excerpt 3, the motivations can be classified as follows:
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External Motivation: Mike's hope for a promotion and the promise made by his boss are examples of external motivation. His desire to work extra hours is influenced by an external factor (the possibility of a promotion).
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Internal Motivation: While the excerpt primarily highlights external motivations, there may be an internal component as well, depending on Mike's personal aspirations or satisfaction derived from hard work. However, based on the given information, the main motivation appears to be external.
Overall, the primary motivation in this example is external.