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Showing posts with label economy. Show all posts
Showing posts with label economy. Show all posts

Wednesday, March 23, 2011

Present Worth (PW) and Future Worth (FW) for Project Evalutaion

Financial decisions require consideration of projected revenues and expenditure over period of time being considered. Performing a Cost/Benefit Analysis is essential to sound financial decision making. A critical part of a Cost Benefit Analysis is determining the value of money over time.


Future value measures what today's money would be worth at a specified time in the future assuming a certain discount rate

Present value measure what money at a specified period of time in the future would be worth if valued in terms of today's money.

A capital project must provide a return that exceeds a minimum level established by the organization. The minimum level is reflected in a firm's Minimum Attractive Rate of Return (MARR) or hurdle rate. MARR is treated as the interest rate chargedd by the source of the capital. In theory, the MARR is the interest rate that could be received if the funds were invested elsewhere. In practice, it is determined by the top-management and depends on:

the amount of money available for investment
the source and cost of these funds
the number of good project available for investment opportunities
the cost of administering investments
the type of organization


The most used method is the present worth (PW) method. It is a function of i% (found by discounting all cash inflows and outflows to the present time at an interest rate that is generally the MARR. A positive PW for an investment project means that the project is acceptable.

Net Present Worth (NPW) is the future stream of benefits and cost converted into equivalent values today. Program with a positive NPW are generally cost effective and the another way round. NPW is a criterion for deciding whether a project can be justified on economic principles.

PW(i%) = F(1+i)^-k

Example: Which is more financially sound project? Project A produce $5000 in 2006, Project B produces $5200 in 2007... (i assumed 4.5%)
2006 is PV and 2007 is FV.
PV of 2007 = $5200/(1+0.45) = $4976
Hence Project A is chosen.

Example2: Consider a project that has an initial investment of $50000 and that returns $18000 per year for the next four years. If the MARR is 12%, is this a good investment?
PW = -50000 + 18000(P/A, 12%, 4) = $4671.40
This is a good investment.

The commercial value of a bond is the PW of all future net cash flows expected to be received the period dividend [face or par value (Z) times the bond or nominal rate per interest period,r], and the redemption of disposal price (C), all discounted to the present at the bond;s ield rate per period or effective interest rate, i%.
Vn = C(P/F, i%, N) + rZ(P/A, i%, N)

Example: What is the current value (PW) of a 6% bond rate, 10-year bond with a par (and redemption) value of $20000 that pays dividends semi-annually, if the purchaser wishes to earn an 8% return?
N = 10 x 2 = 20 period before redemption (semi-annually)
r = 6%/2 = 3% per period
i = 8%/2 = 4% per period
C = Z = $20000
Vn = C(P/F, i%, N) + rZ(P/A, i%, N)
= $20000(P/F,4%,20)+(0.03)$20000(P/A,4%,20) = $17282.18

Capitalized worth (CW) is a special variation of present worth of all revenues or expenses over an infinite length of time. The capitalized worth method is especially useful in problems involving endowments and public projects with indefinite lives.

Capitalized worth calculation
1. Draw a cash-flow diagram showing all nonrecurring costs and at least twoo cucles of all recurring (periodic) costs and receipts.
2. Find the present worth of all nonrecurring amounts.
3. Find the equivalent annual worth through one cycle of recurring amounts and add this to all other uniform amounts occurring in years 1 through infinity. This results in a total equivalent uniform annual worth (AW).
4. Divide AW obtained in step 3 by the interest rate to get its capitalized worth.
5. Ass the CW values obtained in steps 2 and 4.

Example: Construction cost: $2000000, Annual maintenance cost: $50000, renovation cost: $500000 every 15 years, Planning horizon: infinite period, Interest rate: 5%...
P = 2000000 + 50000/0.05 + 500000(A/F, 5%, 15)/0.05 = $3464423


Future worth (FW) method is alternative to PW method. FW is based on the equivalent worth of all cash inflows and outflows at the end of the study period at an interest rate that is generally the MARR. Decision made using FW and PW will be the same.

Example: A $4500 investment in a new conveyor system is projected to improve throughout and increasing revenue by $14000 per year for five years. The conveyor will have an estimated market value of $4000 at the end of five years. Using FW and a MARR of 12%, is this good investment?
FW = -$45000(F/P, 12%, 5 + $14000(F/A, 12%, 5) + $4000 = $13635.70
Hence a good investment.

Example2: A company purchased a store chain for $75 million three years ago. There was a et loss of $10 million at the end of year 1 of ownership. Net cash flow is increasing with an arithmetic gradient of $5 million per year starting the second year, and thi pattern is expected to continue for the foreseeable future. Expected MARR of 25% per year...
The comapany has just been offered $159.5 million to sell the store. Use FW analysis to determine if the MARR will be realized at this selling price...
FW = -75(F/P, 25%, 3) - 10((F/P, 25%, 2) - 5(F/P, 25%, 1) + 159.5
= -8.86million
The MARR of 25% will not be realized if the $159.5million offer is accepted.
If the company continues to own the chain, what selling price must be obtained at he end of 5 years of ownership to make the MARR?
FW = -75(F/P, 25%, 5) - 10(F/A, 25%, 5) + 5(A/G, 25%, 5)(F/A, 25%, 5)
= -$246.81 million
The offer must be for at least $246.81 million to make the MARR.


Annual worth is an equal periodic series of dollar amounts that is equivalent to the cash inflows and outflows, at an interest rate that is generally the MARR.
AW(i%) = Revenue - Expenses - CR(i%)

Annual worth analysis measure an investment worth on annual basis. It helps to seek consistency of report format, determine the unit cost and facillitate the unequal project life comparison. AW is easily understood as the results are reported in $/time period.

Example: Consider a project with $30 annual operating cost and a $5000 inverstment required each 5 years. i = 10%
For 1 cycle, EAC = 3000 + 5000(A/P, 10%, 5) = $4.319/yr
For 2 cycle, EAC = 3000 + 5000[1 + (P/F, 10%, 5)](A/P, 10%,10)
= $4319/yr

Capital Recovery (CR) is the annual equivalent cost of the capital invested. The CR covers loss in value of the asset and interest on invested capital (at the MARR). The CR distributes the initial cost(I) and the salvage value (S) across the life of the asset.
CR(i%) = I(A/P, i%, N) - S(A/F, i%, N)

Example: A project requires an initial investment of $45000, has a salvage value of $12000 after six years, incurs annual expenses of $6000 and provides an annual revenue of $18000. Using a MARR of 10%, determine the AW of this project.
AW(10%) = R - E - CR(10%)
CR(10%) = 45000(A/P, 10%, 6) - 12000(A/F, 10%, 6) = 8777
AW(10%) = 18000 - 6000 - 8777 = $3223
Since the AW is positive, it's a good investment.

Example: Land and building cost: $3500000, Annual upkeep cost: $150000, Property taxes and insurance: 5% of total investment, Study period: 25 years, Salvage value: only land cost can be recovered in full...
Ownership cost: CR(15%) = (3500000-1000000)(A/P, 15%, 25)
+ (1000000)(0.15) = $536749
Annual O&M Cost = 0.05(3500000) + 150000 = 325000
Total Equivalent Annual Cost, AEC(15%) = 536749 + 325000 = 861749
Required Monthly Charge = 861749/(12 x 50 x 0.85) = $1690

Internal Rate of Return (IRR) is the discounted rate that equates the present value of a projected cash inflows to the present value of the project's costs. The discount rate which sets the NPV of all cash flows equal to 0. Helps to determine the YIELD on an investment.
NPV = 0 = initial investment + Cash flow year 1/(1+IRR) + ... so on

Example: An investment of a new machine requires $345000 and the estimated market value of the machine after 6 years is $115000. Annual revenue attributable to the new machine will be $120000. Whereas additional annual expenses will be $22000. Determine the IRR if the corporation ;s MARR is 20%...
PW = 0 = -345000+(120000-22000)(P/A,i%,6)+(120000-22000)(P/A,i%,6)
when i=20%, PW=19413
when i=25%, PW=-25621
hence i=22.16%

External Rate of Return (ERR) takes into account the interest rate, external to a project at which net cash flows generated by a project over its life can be reinvested. This is usually the MARR.

Monday, March 21, 2011

Principles of Money-Time Relationship

Capital: Wealth in the form of money or property that can be used to produce more wealth.


Engineering economy studies involves the commitment of capital for extended periods of time. Since, money has its time value, and if money is not invested, the value suffer loses due to interest rates, inflation, currency exchange etc.


Interest: Money paid for the use of borrowed money. It is the rental charge for using an asset over some period of time and then, returning the asset in the same conditions as we received it.

Interest exists to encounter the risk of possibility that borrower will be unable to pay. Moreover, money repaid in the future faces inflation. Besides, the lender would need to undergo transaction costs and opportunity cost. This way, postponement of use of money occurred. On the other hand, interest is always a cost for borrowers.


An example of decision dilemma:
Take a Lump Sum or Annual Installments
A married couple won 4D and they had to choose between a single lump sum $104 million, or & 198 million paid out over 25 years ($7.92 million per year). The winning couple opted for the lump sum. Did they make the right choice? What basis do we make such an economic comparison?

We must be able to compare the value of money at different point in time. We need to develop a method for reducing a sequence of benefits and costs to a single point of time and make our comparison on that basis.

Time value of money is measured in terms of interest rate.

Key Terms
Principal(p)
Interest rate (i)
Interest period (n)
Number of interest periods (N)
A plan for receipt (An)
Future amount of money (F)


Method of Calculating interest
Simple Interest: The practice of charging interest rate only to initial sum.
Compound interest: The practice of charging interest rate to initial sum and to any previously accumulated interest that has not been withdrawn.

Simple Interest
I = P x N x i
and he total amount repaid at the end is P + I

Example: If $5000 were loaned for five years at a simple interest rate of 7% per year, the interest earned would be...
I = $5000 x 5 x 0.07 = $1750
So, the total amount repaid at the end of five years would be the original amount plus the interest, $6750.

Compound Interest
n = N : F = P(1+i)^N

Example: If you deposit $100 now (n=0) and $200 two years from now (n=2) in a saving account that pays 10% interest, how much would you have at the end of year 10?
$100(1+0.1)^10 = $259
$200(1+0.1)^8 = $429
F = $259 + $429 = $688

Economic Equivalence exists between cash flow that have the same economic effect and could therefore be traded for one another. Although the amounts and timing of the cash flows may differ, the appropriate interest rate makes them equal.

Example: At an 8% interest, what is the equivalent worth of $3000 back in 5years.
F = $3000(1+0.08)^-5 = $2042

Example2:
n=0, deposit $500
n=3, deposit $1000
find n=1 and n=2 at equivalent values(V)...
V,n2 = $500(1+0.1)^2 + $1000(1+0.1)^-1 = $1514.09
V,n2 = C(1+0.1)^1 + C
C = $721, for n=1 and n=2

Deferred annuities are uniform series that do not begin until some time in the future. Uniform series explains cash flows that changed by a constant amount each period.
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