The market for jelly has a supply and demand given by the following: QD=200-10p QS=20p-100 (c) What is the consumer surplus and producer surplus? (d) Suppose to aid families, the government instates a price ceiling of 9. What is the resulting CS and PS. What is the deadweight loss? answer QS=80 and QD=110, so the market quantity sold is Q=80 at p=9. At Q=80, the demand price is 12, so CS=.5(20-12)80+(12-9)80=560. PS=.5(9-5)80=160. DWL=.5(12-9)(100-80)=30

explain why CS = 0.5(20-12)80+(12-9)80. not CS= 0.5(20-12)80?