ENG 209 Engineering Economy Lecture 5, Section 3.3 (Continue)
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1 ENG 29 Egieerig Ecoomy Lecture 5, Sectio 3.3 (Cotiue) Equal-aymet-Series Sikig-Fud Factor, (F/, i, ) Give: Fid: i = the aual iterest rate. = the umber of iterest periods. F = the future amout. = paymet per period 2 i = F = F( / F, i, ) ( + i) i F ENG 29 Egieerig Ecoomy
2 Example : What amout of equal aual deposits i 6 years at % compouded aually that will be accumulated to KD,? KD, i=% 2 6 ENG 29 Egieerig Ecoomy
3 Example 2: What series of equal paymets is ecessary to repay the KD 5, i 6 years at 5% compouded aually with aual paymets? KD 5, i=5% 2 6 ENG 29 Egieerig Ecoomy 2
4 Equal-aymet-Series Capital-Recovery Factor, (/, i, ) Give: i = aual iterest rate. = umber of aual iterest periods. = preset priciple amout. Fid: = sigle paymet i a series of equal paymet i = F ( + i) ( + i) ( + i ) = i 2 i i( + i) ( + i) = ENG 29 Egieerig Ecoomy 3
5 Example 3: What series of equal paymets is ecessary to repay the KD 5, i 6 years at 5% compouded aually with aual paymets? KD 5, i=5% 2 6 ENG 29 Egieerig Ecoomy 4
6 Equal-aymet-Series reset-worth Factor, (/, i, ) Give: Fid: i = aual iterest rate. = umber of aual iterest periods. = sigle paymet i a series of equal paymet = preset priciple amout 2 i = ( /, i, ) = ( ) + i i( + i) ENG 29 Egieerig Ecoomy 5
7 Example 4: What is the preset worth of a series of eight equal paymets of KD 2 at a iterest rate of 5% compouded aually? ENG 29 Egieerig Ecoomy 6
8 Uiform-Gradiet-Series Factor, (/G, i, ) Ofte periodic paymets do ot occur i equal amouts, ad may icrease or decrease by costat amouts (e.g. KD, KD 2, KD 4, KD 6... KD 2). The gradiet (G) is a value i the cash flow that starts with at the ed of year, G at the ed of year 2, 2G at the ed of year 3, ad so o to (-)G at the ed of year. = G( / G, i, ) G 2 = G i 2 G 3 ( + i) (-2) G - (-) G ENG 29 Egieerig Ecoomy 7
9 Uiform-Gradiet-Series Factor, (/G, i, ) Give: i = aual iterest rate. = umber of aual iterest periods. G = aual charge or gradiet. 2 G G (-2) G (-) G Fid: = sigle paymet = G( / G, i, ) = G i ( + i) ENG 29 Egieerig Ecoomy 8
10 Example 4: O a piece of equipmet, it is estimated that the service expese will be as follows: Year Maiteace KD 2 KD 5 3 KD 4 KD 5 5 KD 2 i=5% What is the equivalet uiform aual maiteace cost for the machiery if the iterest rate is 5%? ENG 29 Egieerig Ecoomy 9
11 Example 5: How much do you have to deposit ow i a savigs accout that ears a 2% aual iterest, if you wat to withdraw the aual series as show i the figure? KD, KD,25 KD,5 KD,75 KD 2, =? ENG 29 Egieerig Ecoomy
12 Example 5: How much do you have to deposit ow i a savigs accout that ears a 2% aual iterest, if you wat to withdraw the aual series as show i the figure? KD, KD,25 KD,5 KD,75 KD 2, =? ENG 29 Egieerig Ecoomy
13 Geometric-Gradiet-Series Factor (/, gꞌ, ) F (+g) - F F (+g) F (+g) 2 F (+g) May egieerig ecoomic problems, particularly those relatig to costructio costs, ivolve cash flows that icrease or decrease over time, ot by a costat amout, but rather by a costat percetage (geometric), called compoud growth. ENG 29 Egieerig Ecoomy 2
14 Geometric-Gradiet-Series Factor (/, gꞌ, ) Give: g = paymet percetage chage. = umber of aual iterest periods. F = first paymet. Calculate: Fid: gꞌ = growth-free rate. = preset priciple amout. F F (+g) 2 F (+g) 2 F (+g) F (+g) - ENG 29 Egieerig Ecoomy 3
15 Geometric-Gradiet-Series Factor (/, gꞌ, ) F (+g) - g = + i + g F F (+g) 2 F (+g) 2 F (+g) F = ( /, g, + g ) F + g ( ) + g g ( + g ) = ENG 29 Egieerig Ecoomy 4
16 Example 5: Use the followig cash flow diagram to calculate the preset worth, where g = 25%, i=3%. F = = 2 ENG 29 Egieerig Ecoomy 5
17 Iterest Formula Summary Fid Give Formula Cash Flow F F = (F/, i, ) F = F (/F, i, ) F F = (F/, i, ) F = F (/F, i, ) = (/, i, ) = (/, i, ) iii F F G F (+g) 2 G (-2) G F (+g) 2 F (+g)-2 - (-) G F (+g) - G = G (/G, i, ) F = F / (+g) (/, gꞌ, ) ENG 29 Egieerig Ecoomy 6
18 Iterest-Factor Extreme Values Iterest Formula = ; i kow i = ; kow (F/, i, ) (/F, i, ) (F/, i, ) (/F, i, ) / (/, i, ) /i (/, i, ) i / ENG 29 Egieerig Ecoomy 7
ENG 209 Engineering Economy Lecture 9, Sections
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