3) W Metals is considering opening a strip mining operation to provide some of the raw materials needed in producing Wmetal. 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 M will need to spend $20 million to restore the land to its original pristine nature appearance. The number of potential IRRs that exist for W mining operation is equal to? 4 What is the Pa hack riod for Wminin o oration