Assume hamburger has a negative income elasticity. Given this assumption, if income falls, what do you expect to happen to the price of hamburger and the quantity of hamburger sold? Why? I need help explaining in words and graphically.

Also, If the price elasticity of demand for gasoline is 0.3 and the current price is $3.20 per gallon, what rise in the price of gasoline will reduce its consumption by 10 percent? (Usethe mid-point method.)