Rearden metals is considering opening a strip mining operation to provide some of the raw materials needed in producing rearden metal. the initial purchase of the land and the associated costs of opening up mining operations will cost $100 million today. the mine is expected to generate $16 million worth of ore per year for the next 12 years. at the end of the 12th year rearden will need to spend $20 million to restore the land to its original pristine nature appearance. one of the irrs for rearden's mining operation is closest to:

Aproduction line has three machines a, b, and c, with reliabilities of .96, .86, and .85, respectively. the machines are arranged so that if one breaks down, the others must shut down. engineers are weighing two alternative designs for increasing the line’s reliability. plan 1 involves adding an identical backup line, and plan 2 involves providing a backup for each machine. in either case, three machines (a, b, and c) would be used with reliabilities equal to the original three. a. compute overall system reliability under plan 1. (round your intermediate calculations and final answer to 4 decimal places.) reliability b. compute overall system reliability under plan 2. (round your intermediate calculations and final answer to 4 decimal places.) reliability c. which plan will provide the higher reliability? plan2plan1