9-51 Consider three alternatives; First cost Uniform annual $50$150 $110 45 30 45 benefit Useful life, in years* *At the end of its useful life, an identical alternative (with the same cost, benefits, and useful life) may be installed. All the alternatives have no salvage value MARR is 10%, which alternative should be selected? (a) Solve the problem by payback period. (b) Solve the problem by future worth analysis. (c) Solve the problem by benefit-cost ratio analysis. (d) If the answers in parts (a), (b), and (c) differ . If the explain why this is the case