Exhibit 5-28 
Use the information in Exhibit 5-28 to calculate the value of price elasticity of demand from point a to b.
Definitions:
Indole
An aromatic heterocyclic organic compound with a bicyclic structure, consisting of a benzene ring fused to pyrrole.
Aromatic
Refers to organic compounds that contain one or more planar rings of atoms with delocalized pi electrons, exhibiting special stability.
Antiaromatic
Antiaromaticity describes molecules that fail to comply with Huckel's rule, having conjugated pi systems with 4n π electrons that lead to destabilization.
Nonaromatic
Referring to organic compounds that do not have the aromatic stability associated with the delocalized pi electrons in a ring structure.
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