A grocery store sells packages containing one pound of bacon and two cartons of eggs. The number $Q$ of packages sold at price $p$ is given by $$Q = 100(6-\sqrt{p})\ .$$

(a) Evaluate the demand elasticity $E$ when $p = 4$.
$E(4)=$

Here, "demand elasticity" is the absolute value of $\displaystyle \frac{\text{percent change in quantity}}{\text{percent change in price}}$ for an infinitesimal change in price, so $$E = \left| \lim_{\Delta p \to 0} \frac{ \Delta Q / Q}{\Delta p / p} \right| \ .$$

(b) Should the price be raised in order to increase revenue? ?? Yes No

(c) For what value of $p$ is the demand elasticity unitary?
$p=$

(d) What is the maximum revenue?
Maximum revenue =