9. The supply and demand functions for a certain product are given by p - s(q) - 0.002q + 1.5 and p - d(q) = 150 - 0.5q, where p is the price in dollars and q is the number of items. (a) (5 points) Find the equilibrium price and quantity. (b) (5 points) Find the consumer surplus at the equilibrium point. (c) (5 points) Find the producer surplus at the equilibrium point. (d) (5 points) Find the total gains at the equilibrium point