2-1. An experimental composite engine block for an automobile will trim 20 pounds of weight compared with a traditional cast iron engine block. It is estimated that at least $2,500 in life-cycle costs will be saved for every pound of weight reduction over the engine’s 8-year expected life. Given that the engine’s life is 8 years, what assumptions have been made to arrive at the $2,500 per pound savings? (2.1)