Engineering Economy Excelerated Ebook __hot__ -

= -25,000 - 500(P/A,8%,10) + 2,000(P/F,8%,10) = -25,000 - 500(6.7101) + 2,000(0.4632) = -25,000 - 3,355 + 926 = -$27,429

= -25,000(A/P,8%,10) - 500 + 2,000(A/F,8%,10) = -25,000(0.14903) - 500 + 2,000(0.06903) = -3,725.75 - 500 + 138.06 = -$4,087.69 / yr engineering economy excelerated ebook

Memorize these. Derivation is optional. Application is mandatory. Problem: You need backup power for a remote telecom tower. Two options: = -25,000 - 500(P/A,8%,10) + 2,000(P/F,8%,10) = -25,000

over 10 years (two cycles) = [-8,000(A/P,8%,5) - 5,500 + 500(A/F,8%,5)] (same for both cycles, so just use one cycle — yes, because AW for one cycle = AW over LCM). = -8,000(0.25046) - 5,500 + 500(0.17046) = -2,003.68 - 5,500 + 85.23 = -$7,418.45 / yr 000 - 500(P/A