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CHAPTER II

M c. Graw. Hill. ENGINEERING ECONOMY Fifth Edition. Blank and Tarquin. CHAPTER II. Factors: How Time and Interest Affect Money. 1. Foundations: Overview. F/P and P/F Factors P/A and A/P Factors F/A and A/F Factors Interpolate Factor Values P/G and A/G Factors Geometric Gradient

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CHAPTER II

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  1. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Factors: How Time and Interest Affect Money Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  2. 1. Foundations: Overview • F/P and P/F Factors • P/A and A/P Factors • F/A and A/F Factors • Interpolate Factor Values • P/G and A/G Factors • Geometric Gradient • Calculate i • Calculate “n” • Spreadsheets Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  3. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Section 1 F/P and P/F Factors Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  4. Fn …………. N P0 2.1 Basic Derivations: F/P factor • F/P FactorTo find F given P To Find F given P Compound forward in time Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  5. 2.1 Derivation by Recursion: F/P factor • F1 = P(1+i) • F2 = F1(1+i)…..but: • F2 = P(1+i)(1+i) = P(1+i)2 • F3 =F2(1+i) =P(1+i)2 (1+i) = P(1+i)3 In general: FN = P(1+i)n FN = P(F/P,i%,n) Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  6. Fn …………. N P 2.1 P/F factor – discounting back in time • Discounting back from the future P/F factor brings a single future sum back to a specific point in time. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  7. 2.1 Present Worth Factor from F/P • Since FN = P(1+i)n • We solve for P in terms of FN • P = F{1/ (1+i)n} = F(1+i)-n • Thus: P = F (1+i)-n =F(P/F,i%,n) Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  8. F = ?? 0 1 2 3 P=$1,000 i=10%/year 2.2 Example- F/P Analysis • Example: P= $1,000;n=3;i=10% • What is the future value, F? F3 = $1,000[F/P,10%,3] = $1,000[1.10]3 = $1,000[1.3310] = $1,331.00 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  9. F9 = $100,000 ………… 0 1 2 3 8 9 P= ?? 2.2 Example – P/F Analysis • Assume F = $100,000, 9 years from now. What is the present worth of this amount now if i =15%? i = 15%/yr P0 = $100,000(P/F, 15%,9) = $100,000(1/(1.15)9) = $100,000(0.1111) = $11,110 at time t = 0 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  10. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Section 2 P/A and A/P Factors Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  11. P = ?? ………….. 1 2 3 .. .. n-1 n 0 2.2 Uniform Series Present Worth and Capital Recovery Factors • Annuity Cash Flow $A per period Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  12. P = ?? 0 1 2 3 n-1 n A = given 2.2 Uniform Series Present Worth and Capital Recovery Factors • Desire an expression for the present worth – P of a stream of equal, end of period cash flows - A Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  13. 2.2 Uniform Series Present Worth and Capital Recovery Factors • Write a Present worth expression [1] Term inside the brackets is a geometric progression. Mult. This equation by 1/(1+i) to yield a second equation Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  14. 2.2 Uniform Series Present Worth and Capital Recovery Factors • The second equation [2] To isolate an expression for P in terms of A, subtract Eq [1] from Eq. [2]. Note that numerous terms will drop out. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  15. 2.2 Uniform Series Present Worth and Capital Recovery Factors • Setting up the subtraction [2] - [1] = [3] Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  16. 2.2 Uniform Series Present Worth and Capital Recovery Factors • Simplifying Eq. [3] further Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  17. 2.2 Uniform Series Present Worth and Capital Recovery Factors • This expression will convert an annuity cash flow to an equivalent present worth amount one period to the left of the first annuity cash flow. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  18. 2.2 Capital Recovery Factor A/P, i%, n The present worth point of an annuity cash flow is always one period to the left of the first A amount • Given the P/A factor Solve for A in terms of P Yielding…. A/P,i%,n factor Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  19. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Section 3 F/A and A/F Factors Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  20. $F ………….. N 2.3 F/A and A/F Derivations • Annuity Cash Flow 0 Find $A given the Future amt. - $F $A per period Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  21. 2.3 Sinking Fund and Series Compound amount factors (A/F and F/A) • Take advantage of what we already have • Recall: • Also: Substitute “P” and simplify! Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  22. 2.3 A/F Factor • By substitution we see: • Simplifying we have: • Which is the (A/F,i%,n) factor Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  23. $F ………….. N 2.3 F/A and A/F Derivations • Annuity Cash Flow 0 Find $F given the $A amounts $A per period Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  24. 2.3 F/A factor from the A/F Factor • Given: • Solve for F in terms of A Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  25. 2.3 Example 2.5 • Formasa Plastics has major fabrication plants in Texas and Hong Kong. • It is desired to know the future worth of $1,000,000 invested at the end of each year for 8 years, starting one year from now. • The interest rate is assumed to be 14% per year. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  26. 2.3 Example 2.5 • A = $1,000,000/yr; n = 8 yrs, i = 14%/yr • F8 = ?? Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  27. 2.3 Example 2.5 Solution: The cash flow diagram shows the annual payments starting at the end of year 1 and ending in the year the future worth is desired. Cash flows are indicated in $1000 units. The F value in 8 years is F = l000(F/A,14%,8) =1000( 13.23218) = $13,232.80 = 13.232 million 8 years from now/ Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  28. 2.3 Example 2.6 • How much money must Carol deposit every year starting, l year from now at 5%per year in order to accumulate $6000 seven years from now? Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  29. 2.3 Example 2.6 • Solution • The cash How diagram from Carol's perspective fits the A/F factor. • A= $6000 (A/F,5.5%,7) = 6000(0.12096) = $725.76 per year • The A/F factor Value 0f 0.12096 was computed using the A/F factor formula Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  30. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Section 4 Interpolation in Interest Tables Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  31. 2.4 Interpolation of Factors • All texts on Engineering economy will provide tabulated values of the various interest factors usually at the end of the text in an appendix • Refer to the back of your text for those tables. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  32. 2.4 Interpolation of Factors • Typical Format for Tabulated Interest Tables Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  33. 2.4 Interpolation (Estimation Process) • At times, a set of interest tables may not have the exact interest factor needed for an analysis • One may be forces to interpolate between two tabulated values • Linear Interpolation is not exact because: • The functional relationships of the interest factors are non-linear functions • Hence from 2-5% error may be present with interpolation. Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  34. 2.4 An Example • Assume you need the value of the A/P factor for i = 7.3% and n = 10 years. • 7.3% is most likely not a tabulated value in most interest tables • So, one must work with i = 7% and i = 8% for n fixed at 10 • Proceed as follows: Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  35. 2.4 Basic Setup for Interpolation • Work with the following basic relationships Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  36. 2. 4 i = 7.3% using the A/P factor • For 7% we would observe: (A/P,7%,10) = 0.14238 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  37. 2. 4 i = 7.3% using the A/P factor • For i = 8% we observe: (A/P,8%,10) = 0.14903 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  38. 2. 4 Estimating for i = 7.3% • Form the following relationships Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  39. 2.4 Final Estimated Factor Value • Observe for i increasing from 7% to 8% the A/P factors also increases. • One then adds the estimated increment to the 7% known value to yield: Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  40. 2.4. The Exact Value for 7.3% • Using a previously programmed spreadsheet model the exact value for 7.3% is: Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  41. Mc Graw Hill ENGINEERING ECONOMYFifth Edition Blank and Tarquin CHAPTER II Section 5 P/G and A/G Factors Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  42. 2.5 Arithmetic Gradient Factors • In applications, the annuity cash flow pattern is not the only type of pattern encountered • Two other types of end of period patterns are common • The Linear or arithmetic gradient • The geometric (% per period) gradient • This section presents the Arithmetic Gradient Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  43. 2.5 Arithmetic Gradient Factors • An arithmetic (linear) Gradient is a cash flow series that either increases or decreases by a constant amount over n time periods. • A linear gradient is always comprised of TWO components: • The Gradient component • The base annuity component • The objective is to find a closed form expression for the Present Worth of an arithmetic gradient Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  44. A1+n-1G A1+n-2G A1+2G A1+G 0 1 2 3 n-1 N 2.5 Linear Gradient Example • Assume the following: This represents a positive, increasing arithmetic gradient Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  45. 2.5 Example: Linear Gradient • Typical Negative, Increasing Gradient: G=$50 The Base Annuity = $1500 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  46. 2.5 Present Worth: Linear Gradient • The present worth of a linear gradient is the present worth of the two components: • 1. The Present Worth of the Gradient Component and, • 2. The Present Worth of the Base Annuity flow • Requires 2 separate calculations! Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  47. 0 1 2 3 4 5 6 7 2.5 Present Worth Point… $700 $600 $500 $400 $300 $200 $100 X The Present Worth Point of the Base Annuity Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  48. X 0 1 2 3 4 5 6 7 The Present Worth Point of the Base Annuity 2.5 Present Worth Point… • PW of the Base Annuity is at t = 0 • PWBASE Annuity=$100(P/A,i%,7) Base Annuity – A = $100 Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  49. $600 $500 $400 $300 $200 $100 $0 0 1 2 3 4 5 6 7 2.5 Gradient Component • The Gradient Component X The Present Worth Point of the Gradient Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

  50. 2.5 Present Worth Point… • The Present worth point of a linear gradient is always: • 2 periods to the left of the “1G” point or, • 1 period to the left of the very first cash flow in the gradient series. DO NOT FORGET THIS! Blank & Tarquin: 5-th Edition Ch. 1 Authored by: Dr. Don Smith Texas A&M University

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