(a) Based on future worth analysis, which of the four alternatives is preferred at 6% interest?
(b) Based on future worth analysis, which alternative is preferred at 15% interest?
(c) Based on the payback period, which alternative is preferred?
(d) At 7% interest, what is the benefit-cost ratio for Alt. G?

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Year E 0$900 100$120 35 35 35 35 0 10 20 30 40 50 20 20 20 0 0 180 20