字典翻译 问答 小学 英语 工程经济学一道题~Thethreealternativesdescribedbelowareavailableforsupplyingacommunitywatersupplyforthenext50yearswhenalleconomiclives,aswellastheperiodofanalysis,terminates.CostProjectAProjectBProjectCConstruc
问题标题:
工程经济学一道题~Thethreealternativesdescribedbelowareavailableforsupplyingacommunitywatersupplyforthenext50yearswhenalleconomiclives,aswellastheperiodofanalysis,terminates.CostProjectAProjectBProjectCConstruc
问题描述:

工程经济学一道题~

Thethreealternativesdescribedbelowareavailableforsupplyingacommunitywatersupplyforthenext50yearswhenalleconomiclives,aswellastheperiodofanalysis,terminates.

CostProjectAProjectBProjectC

ConstructionCost

Year0$20,000,000$10,000,000$15,000,000

Year200$10,000,000$12,000,000

Year350$10,000,0000

MaintenanceCost

Years1-20$70,000$40,000$60,000

Years21-35$80,000$70,000$80,000

Years36-50$90,000$90,000$90,000

Determinewhichprojectispreferredusingthepresentworthmethod.Assumeaninterestrateof4.5%.

以前没学过这是另一门课的题.用presentworthmethod

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.

孙晓丽回答:
  应该是分别求三个工程的净现值NPV,画出相应的现金流量图就OK了   我列出工程a的计算式子,其他两个类似的,最后比较三个NPV的大小,去最小的那个.   NPV(a)=20,000,000+70,000*(P/A,4.5%,20)+80,000*(P/A,4.5%,15)*(P/F,4.5%,20)+90,000*(P/A,4.5%,15)*(P/F,4.5%,35)
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