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Two bridge designs have been proposed for the new interstate highway to cross Rio de Lubbock....

Two bridge designs have been proposed for the new interstate highway to cross Rio de Lubbock. A bridge constructed from wood will cost $6,000 (mucho Rio!) with a useful life of eight years. A bridge constructed from steel will cost $11,000 with a useful life of twenty years. Neither bridge will have any salvage value at the end of its life. Use annual worth analysis with an interest rate of 8% to determine which design should be chosen.

  • Uniform annual cost of wood design:
  • Uniform annual cost of steel design:

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