Question: The inverse demand function for grapes is described by the equation p=676-9q, where p is the price in dollars of grapes demanded per week when

The inverse demand function for grapes is described by the equation p=676-9q, where p is the price in dollars of grapes demanded per week

when p=$28 per crate, what is the price elasticity of demand for grapes?

a) -9/676

b) -9/72

c) -28/648

d) -72/28

e) -252/72

answer is c but don't understand why

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