Uncle Elmo needs to replace the family privy. The local sanitary engineering firm has submitted two alternative structural proposals with respective cost estimates as shown. Which construction should Uncle Elmo choose if his minimum attractive rate of return is 6%. Use both a present worth and annual cost approach in your comparison.

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Brick Masonite First cost Annual maintenance Salvage value Service life, in years $250 $1000 20 10 10 100 20