Question: Help please!! A proposed building may be roofed in either galvanized steel sheet or composition roofing. The composition roof costs $20,000 and must be replaced

Help please!! A proposed building may be roofed in either galvanized steel sheet or composition roofing. The composition roof costs $20,000 and must be replaced every 5 years at the same costs. The steel roof costs $28,000 but the useful life is unknown. If the minimum attractive rate of return (MARR) equals 15%, what is the minimum life that the steel roof must have to make it the better alternative?

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