If the price of gasoline $4 per gallon, 100 gallons will be demanded per day in a small town. If the price increases o $5 per gallon, the quantity demanded will fall to 90 gallons. Calculate the price elasticity of demand for gasoline. (Show your work.) Is demand elastic, unitary elastic, or inelastic? What happens to the quantity demanded if the price of gasoline increases by 30% ? (Show your work.)