（1）Before-tax equilibrium: P = $10 and Q = 300,000 After-tax equilibrium: P = $10.60 and Q = 288,000
Consumers pay $10.60 and producers receive $9.60.
Excess Burden =1/2*12,000*$0.60 + 1/2*12,000*$0.40 = $6,000.
（2）If the negative external cost were equal to $1 per gallon, then a $1 tax would achieve an efficient allocation and would create no excess burden. With a negative external cost of $0.50 per gallon, there is still an excess burden associated with a $1 per gallon tax, but it is smaller since the efficient level of output in this market would be between 288,000 and 300,000.
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