The Inverse Demand Function for Grapes Is Described by the Equation

The inverse demand function for grapes is described by the equation p = 518 - 5q, where p is the price in dollars per crate and q is the number of crates of grapes demanded per week. When p = $38 per crate, what is the price elasticity of demand for grapes?

A) -190/60
B) -5/518
C) -5/95
D) -96/38
E) -38/480