Blooper Industries must replace its magnoosium purification system. Quick & Dirty Systems sells a relatively cheap purification system for $8 million. The system will last 4 years. Do-It-Right sells a sturdier but more expensive system for $18 million; it will last for 9 years. Both systems entail $3 million in operating costs; both will be depreciated straight-line to a final value of zero over their useful lives; neither will have any salvage value at the end of its life. The firm