10. Two common methods of improving fuel efficiency of a vehicle are to reduce the drag coefficient and the frontal area of the vehicle. Consider a car with 1.85m width

and 1.75 m height, with a drag coefficient of 0.30. Determine the amount of fuel and money saved per year as a result of reducing the car height to1.50 m while keeping its width the same. Assume the car is driven 25,000 km(15,000 miles) a year at an average speed of 100 km/h. Take the density and price of gasoline to be 0.74 kg/L and $1.04/L. Also assume the density of air to be1.20 kg/m, the heating value of gasoline to be 44,000 kJ/kg, and the overall efficiency of the car's drive train to be 30%. (Hint: Lecture Notes)