The table below shows hypothetical prices for a particular anatomy textbook at a university bookstore over several years. 
TABLE 2-4 Refer to Table 2-4.Assume that 2015 is used as the base year,with the index number = 100.The value of the index number in 2018 is calculated as follows:
Definitions:
Informal Leadership
Leadership that emerges naturally within a group or organization without formal authority, often based on expertise, charisma, or respect.
Negotiating Identities
The process through which individuals reconcile and integrate aspects of their personal or social identities.
Leaders
Individuals who inspire, influence, and guide others in a way that contributes to the achievement of a group or organizational goals.
Followers
Individuals who support and are guided by a leader or a leading group, often within an organizational or movement context.
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