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9-55 Year E F H 0 -$120 0 0 1 2 3 4 5 -$90 -$110 20 35 20 35 20 35 20 35 20 0 20 0 -$100 0 10 20 30 40 50 0 0 0 180 6 (a) Based on the payback period, which alternative is preferred? (6) Based on future worth analysis, which of the four alternatives is preferred at 5% interest? (c) Based on future worth analysis, which alterna- tive is preferred at 20% interest? (d) At 10% interest, what is the benefit-cost ratio for Alt. G