At a gas station one gallon of regular unleaded gasoline costs $2.458 while one gallon of 10% ethanol added unleaded gasoline is priced $2.159. Assuming the heat content of gasoline and fuel ethanol...

At a gas station one gallon of regular unleaded gasoline costs $2.458 while one gallon of 10% ethanol added unleaded gasoline is priced $2.159. Assuming the heat content of gasoline and fuel ethanol are respectively 5.083 and 3.560 million Btu per barrel, calculate the cost of each fuel per unit energy.