Suppose the price elasticity of demand for heating oil is .2 in the short run and .7 in the long run. Use mid-point methods in A and B and show your work. A) If the price of heating oil rises from $1.80 to $2.20 per gallon, what happens to the quantity of oil demanded in the short run? B) In the long run? C) Why might the elasticity depend on the time horizon?