Please help me with this.

Suppose that the long-run price elasticity of demand for gasoline is 0.55. Assume that the price of gasoline is currently $1.15 per litre, the quantity of gasoline is 140 billion litres per year, and the federal government decides to increase the excise tax on gasoline by $0.30 per litre. Suppose that in the long run the price of gasoline increases by $0.25 per litre after the $0.30 excise tax is imposed.

What is the new quantity of gasoline demanded after the tax is imposed? How effective would a gas tax be in reducing consumption of gasoline in the long run?

How much does the federal government receive from the tax?