Assuming that the price of a pack of cigarettes is $5 before the tax and if the actual price elasticity of demand for California-taxed cigarettes is...

Assuming that the price of a pack of cigarettes is $5 before the tax and if the actual price elasticity of demand for California-taxed cigarettes is 0.8

By how much will the quantity demanded decrease with the new tax ?

How much additional revenue will the state take in ?