Please solve the problems c,d, and e. I'll appreciate if you include explanations.

c. When the market price is $90 there is a surplus of sunglasses - the quantity supplied is greater than the quantity demanded, so there is unsold inventory. How large is the surplus? d. When the market price is $30 there is a shortage of sunglasses - the quantity demanded is greater than the quantity supplied. How large is the shortage? e. At equilibrium, nobody has an incentive to change their behavior, so unless something changes we expect this price to persist. Solve the market equilibrium algebraically. Notice that you have two equations and three unknowns (Qd, Qs, and P). The third equation is the equilibrium condition: Qs = Qd. 90 Price ($) 60 30 D 0 150 300 450 600 750 Q Sunglasses