Suppose demand is given by the equation: 
Using the midpoint method, what is the price elasticity of demand between $2 and $4?
Definitions:
K
Potassium, an essential dietary mineral and a major electrolyte in the body, key for muscle function and nerve transmission.
pH
pH is a scale used to specify the acidity or basicity of an aqueous solution, with values below 7 being acidic, above 7 being basic (alkaline), and exactly 7 being neutral.
HBr
Hydrobromic acid is created by the dissolution of hydrogen bromide into water, resulting in a potent acid.
K
Often represents Potassium in the periodic table, a vital mineral in the human body and an important element in chemistry.
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