Suppose the Demand and Supply Curves for Shampoo Are Given

Multiple Choice

Suppose the demand and supply curves for shampoo are given by
Q^D = 18 - 5P
Q^S = -3 + 2P
Where Q^D is the quantity of shampoo demanded (in thousands of bottles) , Q^S is the quantity supplied, and P is the price of shampoo (in dollars per bottle) . The consumer surplus at the equilibrium price is ____.

A) $9
B) $900
C) $450
D) $4.50