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Annual Worth Analysis in Engineering Economy

Learn about the advantages, uses, and requirements of annual worth analysis in engineering economy. Discover how to calculate equivalent annual cost and the capital recovery cost.

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Annual Worth Analysis in Engineering Economy

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  1. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER VI Annual Worth Analysis Adopted and modified by Dr. W-.W. Li of UTEP, Fall, 2003 Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  2. 6.1 Advantages and Uses of Annual Worth • Popular Analysis Technique • Easily understood – results are reported in $/time period • Eliminates the LCM problem associated with the present worth method • Only have to evaluate one life cycle of a project • General in nature such that: • AW = PW(A/P,i%,n) • AW = FW(A/F,i%,n) • Convert all cash flows to their end- of-period equivalent amounts Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  3. 6.1 Equivalent Annual Cost • Cash-Flow analysis approach where the cash flows are converted to their respective equal, end-of-period amounts. • The result is reported in terms of $/period • Variant of the present worth approach • Popular with some managers who tend to think in terms of “$/year, $/months, etc. Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  4. 6.1 AW and Repeatability Assumption • If two or more alternatives possess unequal lives, then one need only evaluate the AW for any given cycle • The annual worth of one cycle is the same as the annual worth of the other cycles (by assumption) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  5. 6.1 Repeatability Assumption • Given alternatives with unequal lives • The assumptions are: • The services so provided are needed forever • The first cycle of cash flows is repeated for successive cycles • All cash flows will have the same estimated values in every life cycle Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  6. 6. 1. One or More Cycles Cycle 1 Cycle 2 Cycle K Find the annual worth of any given cycle ($/period) Annualize any one of the cycles AW assumes repeatability of CF’s Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  7. 6-year Project 6-year Project 6-year Project 9-year Project 9-year Project 6.1 6-year & 9-year Problem (Ex. 6.1/Ex 5.2) • Need an 18-year study period for both • Present Worth would mandate a 18-year study period • 3 Cycles of the 6-year project • 2 cycles of the 9-year project • Means a lot of calculation time! Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  8. 6-year Project Find the AW of any 6 – year cycle Find the annual worth of any 9-year cycle 9-year Project 6.1 Example 6.1 – Continued • If one assumes the cash flow patterns remain the same for the 6- and 9-year projects, then all one has to do is: And then compare the AW6 yr to AW9 yr. (Study Ex. 6.1 in detail please) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  9. 0 1 2 3 4 5 A 1-5 = $3,000 $5,000 6.1 Additional Example • Consider a project with $3,000 annual operating cost and a $5,000 investment required each 5 years. i = 10% For one cycle EAC = 3,000 + 5,000 (A|P, 10%, 5) = $4,319/yr Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  10. 6 7 8 9 10 A 1-10 = $3,000 $5,000 $5,000 0 1 2 3 4 5 6.1 Multiple cycle..same result! For two cycles EAC = 3000 + 5000 (1+(P|F, .10, 5))(A|P, .10, 10) = 3000 + 1319 = $4319/yr Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  11. 6.1 Advantages of AW • Applicable to a variety of engineering economy studies • Asset Replacement • Breakeven Analysis • Make or Buy Decisions • Studies dealing with mfg. Costs • Economic Value Added analysis (EVA) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  12. 6.1 AW Requirements • Similar to the Present Worth Method, AW analysis requires: • A discount rate before the analysis is started • Estimates of the future cash flows • Estimate of the time period(s) involved Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  13. 6.2 Capital Recovery and AW Values • Assume the potential purchase of any productive asset • One needs to know or estimate: • Initial Investment - P • Estimated Future Salvage Value - S • Estimated life of the asset - N • Estimated operating costs and timing • Operative interest rate – i% Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  14. 6.2 Capital Recovery Cost • Thus, management is concerned about the equivalent annual cost of owing a productive asset. • This cost is termed “Capital Recovery Cost” • CR is a function of {P, S, i%, and “n” } Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  15. S FN ………. 0 1 2 3 N-1 N P0 6.2 Capital Recovery Cost (CR) • CR = the equivalent annual worth of the asset given: Capital Recovery (CR) is the annualized equivalent of the initial investment P0 and the annualized amount of the future salvage value Fn Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  16. S ………. • Convert to: FN ………. 0 1 2 3 N-1 N 0 1 2 3 N-1 N P0 6.2 Capital Recovery Cost – CR • Given: X X $A per year (CRC) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  17. S Salvage for FN $ at t = N ….. … …. N Invest P 0 $ P 6.2 Capital Recovery Cost Cost = “+” and SV = “-” by convention • COMPUTING CR FOR INVESTMENTS WITH SALVAGE VALUES: EAC = P(A|P, i, n) - S(A|F, i, n) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  18. 6.2 Capital Recovery Cost • COMPUTING CR FOR INVESTMENTS WITH SALVAGE VALUES: Method I - compute EAC of the original cost and subtract the EAC of the salvage value EAC = P(A|P, i, n) - S(A|F, i, n) Method II– Subtract the salvage value from the original cost and compute the annual cost of the difference. Add to that the interest that the salvage value would return each year, SV (i). CR(i%)= (P - S) (A|P, i, n) + S(i) Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  19. 6.2 CR – Explained • CR(i%) = (P - SV) (A|P, i, n) + SV(i) CR is the annual cost associated with owning a productive asset over N time periods at interest rate “i%” per period Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  20. 6.2 CR - Explained • A firm invests the owners’ money in productive assets. • Not the firm’s money – belongs to the owners of the firm. • The owners expect a return on their funds being invested. Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  21. 6.2 CR - Explained • If the firm invests in a productive asset, then the annual cost of the investment at time t = 0 and… • The estimated future salvage value “n” time periods hence… • Must be evaluated using an appropriate discount rate because…. Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  22. 6.2 CR - Explained • The owner’s funds are tied up in the investment cost at time t = 0 and could have been invested elsewhere. • Thus, the annualized cost of the time t = 0 investment must be determined to reflect the commitment of funds to the asset. Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  23. 6.2 CR – Sign Conventions • Two approaches for signs • Let “P” carry a negative sign (investment) • Let “S” carry a positive sign (if a positive salvage value) • Then CR will carry a negative sign • Let “P” carry a positive sign and “S” a negative sign • Treats “costs” as positive values and any positive salvage as a negative value Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  24. 6.3 Alternatives by Annual Worth • Given a discount rate (in advance) • AW is perhaps the easiest method to apply for analysis of alternatives • Mutually Exclusive Analysis • Select the one best alternative • Single Alternative • Accept if AW positive, else reject Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  25. 6.3 AW – Mutually Exclusive • Given a set of two or more alternatives, determine the AW (i%), then • Select the alternative with the lowest annual cost or the highest annual net cash flow • If pure cost situation – select min. cost alternative • If mixed costs and revenues – select the max. AW (i%) alternative Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  26. S = +$1,500 A+ = $1,200/yr 1 2 3 4 5 -$650 -$700 -$750 P=-23,000 -$800 -$850 6.3 Example 6.3 • Cash Flow Diagram is: Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  27. S = +$1,500 1 2 3 4 5 P=-23,000 6.3 Example 6.3 • The Capital Recovery component is: CR(10%) = -23,000(A/P,10%,5) + 1,500(A/F,10%,5) = -$5,822 Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  28. A+ = $1,200/yr 1 2 3 4 5 $650 $700 $750 $800 $850 6.3 Example 6.3 • Revenue – Op Costs are: Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  29. 6.3 Example 6.3 • Cost Revenue component is seen to equal (costs treated as positive values): =+550 – 50(A/G,10%,5) = 550 – 90.50 = $459.50 1.8101 Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  30. 6.3 Example 6.3 • Total Annual worth (CR + Cost/Rev) • CR(10%) = -$5,822 • Revenue/Cost Annual amount: $459.50 • AW(10%) = -$5,822+$459.50 • AW(10%) = $5,362.50 This amount would be required to recover the investment and operating costs at the 10% rate on a per-year basis Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  31. 6.4 AW of a Perpetual Investment • EAC of a perpetual investment • If an investment has no finite cycle, it is called a perpetual investment. If “P” is the present worth of the cost of that investment, then EAC is P times i, the interest P would have earned each year. EAC=A = P* i Remember: P = A/i From the previous chapter Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  32. 6.4 Example: Perpetual Investment • EXAMPLE Two alternatives are considered for covering a football field. The first is to plant natural grass and the second is to install AstroTurf. Interest rate is 10%/year. Assume the field is to last a “long time”. Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  33. 6.4 Example – Continued Alternative A: Natural Grass – Replanting will be required each 10 years at a cost of $10,000. Annual cost for maintenance is $5,000. Equipment must be purchased for $50,000, which will be replaced after 5 years with a salvage value of $5,000 Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  34. F5 = $5,000 F5 = $5,000 F5=$50,000 P = $50,000+ $10,000 6.4 – Example: Natural Grass Since cost is predominate, let (+) = cost and (-) = salvage values Alternative A: 0 1 2 3 4 5 6 7 8 9 10 A = $5,000 Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  35. 6.4 Example: Natural Grass – Analysis • (+) $60,000 (A/P,10%,10) • (+) $5,000 (already an annual cost) • (+) $50,000 (P/F,10%,5)(A/P,10%,10) • (-) $5,000 (P/F,10%,5)(A/P,10%,10) • (-) $5,000 (A/F,10%,10) • = $ ? /year Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

  36. 6.4 Example: Artificial Carpet (Surface) • A = P(i) for a perpetual life project • Annual Cost of Installation: • =$150,000 (.10) = $15,000/ year • Annual Maintenance = $5,000/year • Total: $15,000 + $5,000 = $20,000/Yr • Choose A, cost less per year! Blank & Tarquin: 5th Edition. Ch. 6 Authored by: Dr. Don Smith, Texas A&M University.

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