21. A regional airline company estimated four years ago that each pound of aircraft weight adds $60 per year to its fuel expense. Now the cost of jet fuel has doubled from what it was four years ago. A recent engineering graduate employed by the company has made a recommendation to reduce fuel consumption of an aircraft by installing leather seats as part of a “cabin refurbishment program.” The total reduction in weight would be approximately 500 pounds per aircraft. If seats are replaced annually

(a worst-case situation), how much can this airline afford to spend on the cabin refurbishments? What nonmonetary advantages might be associated with the refurbishments? Would you support the engineer’s recommendation? (2.1)