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Engineering Economy Lecture 8 Evaluating a Single Project IRR continued Payback Period

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Breakeven Interest Rate 2

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Figure 5-5 Use of Linear Interpolation to Find the Approximation of IRR for Example 5-12

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Figure 5-6 Spreadsheet Solution, Example 5-12

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Figure 5-7 Spreadsheet Solution, Example 5-13 (a) Direct Computation of IRR

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Figure 5-7 (continued) Spreadsheet Solution, Example 5-13 (b) Graphical Determination of IRR

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5. THE PAYBACK PERIOD Method is simple, but possibly misleading. The simple payback period is the number of years required for cash inflows to just equal cash outflows. It is a measure of liquidity rather than a measure of profitability.

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18 Payback Period Methods SIMPLE Payback Period DISCOUNTED Payback Period

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Payback is simple to calculate. The simple payback period is the smallest value of θ (θ ≤ N) for which the relationship below is satisfied. For discounted payback future cash flows are discounted back to the present, so the relationship to satisfy becomes

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Problems with the payback period method. It doesn’t reflect any cash flows occurring after θ, or θ'. It doesn’t indicate anything about project desirability except the speed with which the initial investment is recovered. Recommendation: use the payback period only as supplemental information in conjunction with one or more of the other methods in this chapter.

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Finding the simple and discounted payback period for a set of cash flows. End of Year Net Cash Flow Cumulative PW at 0% Cumulative PW at 6% 0-$42,000 1$12,000-$30,000-$30,679 2$11,000-$19,000-$20,889 3$10,000-$9,000-$12,493 4$10,000$1,000-$4,572 5$9,000$2,153 The cumulative cash flows in the table were calculated using the formulas for simple and discounted payback. From the calculations θ = 4 years and θ' = 5 years.

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Engineering Economics

Engineering Economics

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