A 189 lb man eats an order of FrenchFries consuming 250 Cal of food energy. Afterwards he feels guilty and decides to work off the excess calories by walking upsix flights of stairs 3.0 times. (The total height of six flights of steps is 90. ft) Calculate the energy the man has burned off by doing the exercise. Assume that work is done only when walking up the steps. Note: 1 Cal = 4.184 kJ