问题描述：
工程经济学一道题~
The three alternatives described below are available for supplying a community water supply for the next 50 years when all economic lives,as well as the period of analysis,terminates.
Cost Project A Project B Project C
Construction Cost
Year 0 $20,000,000 $10,000,000 $15,000,000
Year 20 0 $10,000,000 $12,000,000
Year 35 0 $10,000,000 0
Maintenance Cost
Years 1 - 20 $70,000 $40,000 $60,000
Years 21 - 35 $80,000 $70,000 $80,000
Years 36 - 50 $90,000 $90,000 $90,000
Determine which project is preferred using the present worth method.Assume an interest rate of 4.5%.
以前没学过 这是另一门课的题.用present worth method
排版有点乱，费用是3个工程排在一起 工程a的建设费用是0年$20,000,000，后面2个阶段都是0.工程b是3个阶段开始都投资$10,000,000，工程c是第35年是0.
The three alternatives described below are available for supplying a community water supply for the next 50 years when all economic lives,as well as the period of analysis,terminates.
Cost Project A Project B Project C
Construction Cost
Year 0 $20,000,000 $10,000,000 $15,000,000
Year 20 0 $10,000,000 $12,000,000
Year 35 0 $10,000,000 0
Maintenance Cost
Years 1 - 20 $70,000 $40,000 $60,000
Years 21 - 35 $80,000 $70,000 $80,000
Years 36 - 50 $90,000 $90,000 $90,000
Determine which project is preferred using the present worth method.Assume an interest rate of 4.5%.
以前没学过 这是另一门课的题.用present worth method
排版有点乱，费用是3个工程排在一起 工程a的建设费用是0年$20,000,000，后面2个阶段都是0.工程b是3个阶段开始都投资$10,000,000，工程c是第35年是0.
问题解答：
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