The market for apples is represented by the following demand and supply functions:
Qd = 30 - p;
Qs = 15 + 2p.
(a) Prepare a demand and supply schedule for the market, given the prices $2.00, $4.00 and $7.00.

(b) (i) Determine the equilibrium price and equilibrium quantity of apples in the market.
(ii) If the price of apple is fixed at $3.00, what will be the excess demand or excess supply.
(c) Suppose the demand function changed to Qd = 40 - p. Using the prices in (a) above:
(i) prepare a new demand schedule;
(ii) does it represent an increase or a decrease in demand?
(iii) explain your answer in (c) (ii) above.