The annual benefits associated with construction of a highway are estimated at $10.5 million by a local 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 annual 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