The demand function for a Christmas music CD is given by where $x$ (measured in units of a hundred) is the quantity demanded per week and $p$ is the unit price in dollars.

(a) Evaluate the elasticity at 10. $E(10)=$

(b) Should the unit price be lowered slightly from 10 in order to increase revenue?

(c) When is the demand unitary? $p=$ dollars

(d) Find the maximum revenue. Maximum revenue = hundreds of dollars

Your overall score for this problem is