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?