3. The local gasoline market in a particular city has demand and supply curves given by the following data. (All quantities are in millions of gallons per month.)

Price per gallon $1.00 $1.50 $2.00 $2.50 $3.00 $3.50 $4.00 Quantity demanded 6 5 4 3 2 1 0 Quantity supplied 0 1 2 3 4 5 6