The salary in Arizona has decreased by 3% over the last 3 months. During this time, the sale of Snickers chocolate bars has decreased by 2% and gas sales decreased by 1%. What is the income elasticity for Snickers chocolate bars using these facts, and would it be a normal or inferior good? Can you calculate the cross-price elasticity for Snickers and gas? If yes, then calculate it. If not, then what information would you need?