Question
Consider the two devices below with a useful lifetime of 7 years. Which device should we purchase?
Device A 5,000 1,000 Device B 3,000 Costs Costs Annual Saving First year Saving Saving increment Interest Rate % Salvage Valu
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Answer #1

NPW of A = -5000 + 1000 * (P/A, 5%,7) + 990 * (P/F, 5%,7)

= -5000 + 1000 * 5.786373 + 990 * 0.710681

= 1489.94

NPW of B = -3000 + 700 * (P/A, 5%,7) + 300 * (P/G, 5%,7) + 450 * (P/F, 5%,7)

= -3000 + 700 * 5.786373 + 300 * 16.232082 + 450 * 0.710681

= 6239.89

As NPW of B is higher, it should be selected

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