The accompanying chart presents data on the price of fuel oil the quantity deman

The accompanying chart presents data on the price of fuel oil the quantity demanded of fuel oil and the quantity demanded for insulation.Fuel OilInsulationPrice per GallonQuantity Demanded (millions of gallons)Quantity Demanded(millions of tons)$3.00100
30$5.0090
35$7.0060
40a. Calculate the price elasticity (arc elasticity) of demand for fuel oil as its price rises from $3.00 to $5.00; from $5.00 to $7.00. Calculate the change in total revenue in the two cases. Explain how the changes in revenue relate to your estimated elasticities.b. Calculate the arc cross elasticity of demand for insulation as the price of fuel oil rises from $5.00 to $7.00. Are fuel oil and insulation substitutes or complements? Explain.