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The annual benefits associated with construction of highway are estimated at $10.5 million by a planning commission. The initial construction costs will be $400 million and the project's useful life is 40 years. Annual maintenance costs are $500,000 with periodic rebuilding costs of $10 million every 10 years. If interest is 4% the benefit-cost ratio is closest to what value? Show your work. a) 1.11 b) 0.93 c) 0.75 d) 0.49