Quasimodo has a demand function for earplugs that is given by the equation D(p) = 100 − p.
(a) If the price of earplugs is $50, how many earplugs will he consume?
(b) If the price of earplugs is $70, how many earplugs will he consume?
(c) What is the change in net consumer’s surplus when the price changes from $50 to $70?