We need to find the elasticity $E(p)$. The formula for elasticity of demand is $E(p) = -\frac{p}{q} \cdot \frac{dq}{dp}$.
First, let's find the derivative of $q$ with respect to $p$, i.e., $\frac{dq}{dp}$.
$q = (376 - p)^{1/2}$
Using the chain rule,
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